{"id":36718,"date":"2019-10-31T22:13:20","date_gmt":"2019-10-31T19:13:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novaya-statya-agressivnyj-razgon-i-andervolting-radeon-rx-5700-i-radeon-rx-5700-xt-kak-eto-sdelat-i-nuzhno-li\/"},"modified":"2019-10-31T22:13:20","modified_gmt":"2019-10-31T19:13:20","slug":"novaya-statya-agressivnyj-razgon-i-andervolting-radeon-rx-5700-i-radeon-rx-5700-xt-kak-eto-sdelat-i-nuzhno-li","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/novaya-statya-agressivnyj-razgon-i-andervolting-radeon-rx-5700-i-radeon-rx-5700-xt-kak-eto-sdelat-i-nuzhno-li","title":{"rendered":"Nov\u00fd \u010dl\u00e1nek: Agresivn\u00ed p\u0159etaktov\u00e1n\u00ed a undervolting Radeon RX 5700 a Radeon RX 5700 XT: jak to prov\u00e9st a je to pot\u0159eba","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u0161echno mi je dovoleno, ale ne v\u0161echno je prosp\u011b\u0161n\u00e9<\/p>\n

Nov\u00fd z\u00e1kon, Kor. 10:23<\/p>\n

Grafick\u00e9 karty NVIDIA v posledn\u00edch letech p\u0159\u00edli\u0161 neut\u011b\u0161uj\u00ed b\u011b\u017en\u00e9 hr\u00e1\u010de mo\u017enost\u00ed p\u0159etaktov\u00e1n\u00ed. Ji\u017e na desk\u00e1ch 10. s\u00e9rie jsou algoritmy automatick\u00e9ho \u0159\u00edzen\u00ed taktovac\u00edch frekvenc\u00ed GPU nastaveny tak, aby vyu\u017eily v\u011bt\u0161inu v\u00fdkonov\u00e9ho rezervy v r\u00e1mci v\u00fdpo\u010dtov\u00e9ho TDP a schopnost\u00ed chladic\u00edho syst\u00e9mu. Akceler\u00e1tory rodiny Turing naopak definitivn\u011b zklamaly overclockery, nebo\u0165 i «extr\u00e9mn\u00ed» za\u0159\u00edzen\u00ed ur\u010den\u00e1 pro p\u0159etaktov\u00e1n\u00ed pod tekut\u00fdm dus\u00edkem, — jako je MSI GeForce RTX 2080 Ti LIGHTNING Z<\/a><\/noindex> — v podstat\u011b postr\u00e1daj\u00ed funkci softwarov\u00e9ho voltmodu. Posledn\u00ed rezervac\u00ed, kde st\u00e1le p\u0159etaktov\u00e1n\u00ed \u017eije, z\u016fst\u00e1vaj\u00ed grafick\u00e9 karty AMD. S «Radeonem» na \u010dipech Polaris a Vega si lze dostate\u010dn\u011b pohr\u00e1t, a to i s opa\u010dn\u00fdm \u00famyslem — aby se sn\u00ed\u017eila spot\u0159ebov\u00e1van\u00e1 energie pomoc\u00ed undervoltingu.<\/p>\n

Nov\u00e9 Radeon RX 5700 a RX 5700 XT<\/a><\/noindex> jsou tak\u00e9 p\u0159ipraveny na experimenty. Vysok\u00e1 energetick\u00e1 \u00fa\u010dinnost, kterou zajistila architektura RDNA a v\u00fdrobn\u00ed proces 7 nm, sama o sob\u011b otev\u00edr\u00e1 l\u00e1kav\u00e9 perspektivy, a i vybaven\u00ed referen\u010dn\u00edch grafick\u00fdch karet nen\u00ed zase tak \u0161patn\u00e9, jak by se na prvn\u00ed pohled mohlo zd\u00e1t. Maj\u00ed siln\u00fd VRM s velk\u00fdm rezervou proudu, a dokonce lze nadhodnocen\u00e9 nap\u011bt\u00ed pro grafick\u00fd procesor pova\u017eovat z pozitivn\u00edho hlediska: je zde prostor jak pro p\u0159etaktov\u00e1n\u00ed, tak pro undervolting. Jen chladi\u010d zklamal, ale s t\u00edm zat\u00edm — do p\u0159\u00edjezdu prvn\u00edch partnersk\u00fdch grafick\u00fdch karet v polovin\u011b srpna — budeme muset vydr\u017eet. V ka\u017ed\u00e9m p\u0159\u00edpad\u011b slab\u00fd syst\u00e9m chlazen\u00ed nebr\u00e1n\u00ed zjistit p\u0159edem, na co jsou \u010dipy Navi schopny, vzhledem k posledn\u00edm \u00fasp\u011bch\u016fm overclockersk\u00e9 my\u0161lenky, nebo\u0165 pro v\u00e1s, draz\u00ed \u010dten\u00e1\u0159i, jsme p\u0159ipraveni sn\u00e1\u0161et hluk turb\u00edny na zv\u00fd\u0161en\u00fdch ot\u00e1\u010dk\u00e1ch.<\/p>\n

\"Nov\u00fd<\/p>\n

Softwarov\u00e9 tabulky PowerPlay slibuj\u00ed pracovn\u00ed frekvence pro Radeon RX 5700 XT a\u017e 2,3 GHz. Testy s vodn\u00edm chlazen\u00edm, kter\u00e9 provedli na\u0161i zahrani\u010dn\u00ed kolegov\u00e9, ji\u017e potvrdily, \u017ee pokud ne 2,3, tak 2,2 GHz \u2014 to je zcela dosa\u017eiteln\u00fd v\u00fdsledek. P\u0159etaktov\u00e1n\u00ed z\u00e1kladn\u00ed verze Radeon RX 5700 vypad\u00e1 jako bezprobl\u00e9mov\u00e1 investice, proto\u017ee karta pracuje na p\u016fvodn\u011b sn\u00ed\u017een\u00fdch frekvenc\u00edch GPU. Ale nebudeme p\u0159edst\u00edrat, \u017ee tyto \u0159\u00e1dky byly naps\u00e1ny p\u0159edt\u00edm, ne\u017e jsme provedli na\u0161e vlastn\u00ed testy. V podm\u00ednkov\u011b neomezen\u00e9m p\u0159etaktov\u00e1n\u00ed \u010dip\u016f Navi se uk\u00e1zalo, \u017ee je m\u00e9n\u011b praktick\u00e9ho smyslu, ne\u017e jsme p\u0159edpokl\u00e1dali \u2014 alespo\u0148 to plat\u00ed pro \u0161pi\u010dkov\u00fd model. A nemus\u00ed to b\u00fdt pouze o kvalit\u011b chlazen\u00ed a spot\u0159ebovan\u00e9 energii, na kter\u00e9 p\u0159i maxim\u00e1ln\u00edm p\u0159etaktov\u00e1n\u00ed mysl\u00edme jako na posledn\u00ed.<\/p>\n

Ale jinak experimenty s nov\u00fdmi \u201eRadeony\u201c p\u0159inesly mnoho podn\u011bt\u016f \u2014 a o perspektiv\u011b nov\u00fdch GPU na 7nm v\u00fdrobn\u00edm procesu, a o probl\u00e9mech, kter\u00e9 br\u00e1n\u00ed v\u00fdkonu modern\u00edch spot\u0159ebitelsk\u00fdch grafick\u00fdch karet obou v\u00fdrobc\u016f. Nakonec vznikl dal\u0161\u00ed \u00fakol: jak moc lze sn\u00ed\u017eit spot\u0159ebovanou energii Radeon RX 5700 a RX 5700 XT pomoc\u00ed undervoltingu s minim\u00e1ln\u00edmi ztr\u00e1tami v\u00fdkonu (a tedy i zah\u0159\u00edv\u00e1n\u00ed a hladiny hluku)? Ukazuje se, \u017ee mnohem v\u00edce, ne\u017e se na prvn\u00ed pohled zd\u00e1lo.<\/p>\n

\u2b07<\/a><\/noindex>#<\/a><\/noindex>Tepeln\u00e1 rozhran\u00ed referen\u010dn\u00edch grafick\u00fdch karet: grafitov\u00e1 podlo\u017eka m\u00edsto tepeln\u00fdch past.<\/strong><\/h2>\n

Ne\u017e se pust\u00edme do p\u0159etaktov\u00e1n\u00ed, undervoltingu a n\u00e1sledn\u00e9ho m\u011b\u0159en\u00ed v\u00fdkonu Radeon RX 5700 a RX 5700 XT, poj\u010fme uzav\u0159\u00edt jednu sekund\u00e1rn\u00ed ot\u00e1zku. Je zn\u00e1mo, \u017ee od Radeon VII<\/a><\/noindex> se jako tepeln\u00fd rozhran\u00ed mezi GPU a chladi\u010dem referen\u010dn\u00edch grafick\u00fdch karet AMD pou\u017e\u00edv\u00e1 grafitov\u00e1 podlo\u017eka, a ne klasick\u00e1 tepeln\u00e1 pasta. Pro po\u0159\u00edzen\u00ed fotografi\u00ed ti\u0161t\u011bn\u00fdch obvod\u016f v p\u016fvodn\u00edm p\u0159ehledu akceler\u00e1tor\u016f jsme demontovali chladic\u00ed syst\u00e9m, a tepeln\u00e1 podlo\u017eka to nep\u0159e\u017eila, roztrhla se na kusy. Tak pro\u010d nezkontrolovat, jak se zm\u011bnily pracovn\u00ed parametry chladi\u010de po v\u00fdm\u011bn\u011b tepeln\u00e9ho rozhran\u00ed za osv\u011bd\u010denou pastu ARCTIC MX-2.<\/p>\n

\"Nov\u00fd<\/p>\n

Grafitov\u00e1 podlo\u017eka, vybran\u00e1 AMD pro Radeon VII a Navi, se naz\u00fdv\u00e1 Hitachi TC-HM03 a vynik\u00e1 extr\u00e9mn\u011b vysokou tepelnou vodivost\u00ed ve srovn\u00e1n\u00ed s tepeln\u00fdmi pastami \u2014 40\u201390 W\/(m\u00b7K). Pro srovn\u00e1n\u00ed: tepeln\u00e1 vodivost ARCTIC MX-2 \u010din\u00ed pouze 5,6 W\/(m\u00b7K), zat\u00edmco vysoce kvalitn\u00ed pasta Thermal Grizzly Kryonaut dosahuje 12,5 W\/(m\u00b7K). Mezi v\u0161emi typy tepeln\u00fdch rozhran\u00ed, kter\u00e9 se pou\u017e\u00edvaj\u00ed k odv\u00e1d\u011bn\u00ed tepla z mikrochip\u016f, m\u00e1 pouze kapaln\u00fd kov lep\u0161\u00ed vlastnosti \u2014 nap\u0159\u00edklad 73 W\/(m\u00b7K) u slitiny Thermal Grizzly Conductonaut. Existuje v\u0161ak n\u011bkolik d\u016fvod\u016f, pro\u010d materi\u00e1ly jako Hitachi TC-HM03 dosud nevytla\u010dily tepeln\u00e9 pasty z jak\u00fdchkoli chladic\u00edch syst\u00e9m\u016f. Za prv\u00e9, jsou prost\u011b drah\u00e9, a za druh\u00e9, v\u00fdsledn\u00e1 tepeln\u00e1 vodivost rozhran\u00ed je nep\u0159\u00edmo \u00fam\u011brn\u00e1 jeho tlou\u0161\u0165ce, kter\u00e1 je u podlo\u017eky z\u0159ejmn\u011b v\u011bt\u0161\u00ed ne\u017e u tepeln\u00e9 pasty \u2014 za p\u0159edpokladu, \u017ee chladi\u010d je adekv\u00e1tn\u011b a rovnom\u011brn\u011b p\u0159itla\u010den. Ale \u0159\u00edk\u00e1 se, \u017ee pr\u00e1v\u011b nedostatky referen\u010dn\u00edch chladi\u010d\u016f byly d\u016fvodem, pro\u010d se AMD rozhodlo vzd\u00e1t tepeln\u00e9 pasty nejprve u Radeon VII a pot\u00e9 i u akceler\u00e1tor\u016f na \u010dipech Navi.<\/p>\n

\"Nov\u00fd<\/p>\n

Ka\u017edop\u00e1dn\u011b, grafitov\u00e1 podlo\u017eka na\u0161im grafick\u00fdm kart\u00e1m chyb\u00ed, a zde je, k \u010demu to vedlo. Tepeln\u00e1 pasta v\u016fbec neovlivnila \u00farove\u0148 hluku a stabiln\u00ed frekvence pod z\u00e1t\u011b\u017e\u00ed (ty se posunuly pouze o 12\u201337 MHz v testu Crysis 3), av\u0161ak teploty GPU se p\u0159esto sn\u00ed\u017eily \u2014 u star\u0161\u00edho modelu o 3 \u00b0C, zat\u00edmco \u010dip \u201eoby\u010dejn\u00e9ho\u201c Radeon RX 5700 zchladl o cel\u00fdch 13! Zd\u00e1 se, \u017ee v testovac\u00edm vzorku nebylo na za\u010d\u00e1tku v\u0161e v po\u0159\u00e1dku se sestavou chlad\u00edc\u00edho syst\u00e9mu. V ka\u017ed\u00e9m p\u0159\u00edpad\u011b jsme nyn\u00ed p\u0159esv\u011bd\u010deni, \u017ee Hitachi TC-HM03 m\u00edsto b\u011b\u017en\u00e9 tepeln\u00e9 pasty \u2014 to nen\u00ed probl\u00e9m, ale z\u00e1rove\u0148 to nen\u00ed z\u00e1zra\u010dn\u00fd prost\u0159edek, bez kter\u00e9ho nemohou referen\u010dn\u00ed \u201eRadeony\u201c obej\u00edt. Ani jsme nemuseli zvy\u0161ovat p\u0159\u00edtlak pomoc\u00ed podlo\u017eek na \u0161roubech chladi\u010de, abychom kompenzovali rozd\u00edl v tlou\u0161\u0165ce mezi vrstvou tepeln\u00e9 pasty a grafitovou podlo\u017ekou. A u\u017e v\u016fbec by nem\u011blo smysl ji odstra\u0148ovat s o\u010dek\u00e1v\u00e1n\u00edm, \u017ee t\u00edm l\u00e9pe p\u0159etaktujeme grafick\u00fd procesor \u2014 otev\u0159en\u011b slab\u00fd chladi\u010d na referen\u010dn\u00edch desk\u00e1ch to rozhodn\u011b neoprav\u00ed.<\/p>\n

\u2b07<\/a><\/noindex>#<\/a><\/noindex>P\u0159etaktov\u00e1n\u00ed Radeon RX 5700 a RX 5700 XT s pomoc\u00ed softwarov\u00fdch tabulek PowerPlay<\/strong><\/h2>\n

P\u0159ed popisem metody, kter\u00e1 odblokov\u00e1v\u00e1 taktovac\u00ed frekvence, nap\u00e1jec\u00ed nap\u011bt\u00ed a rezervu v\u00fdkonu grafick\u00fdch karet na \u010dipech Navi, vyneseme b\u011b\u017en\u00e9 upozorn\u011bn\u00ed. Jak\u00e9koli p\u0159etaktov\u00e1n\u00ed, zejm\u00e9na daleko za hranice standardn\u00edch parametr\u016f, prov\u00e1d\u00edte na vlastn\u00ed riziko a nesete zodpov\u011bdnost za jeho d\u016fsledky. O bezpe\u010dnosti \u010dip\u016f Navi a dal\u0161\u00edch komponent\u016f grafick\u00e9 karty v takov\u00fdch podm\u00ednk\u00e1ch nikdo nezaru\u010duje.<\/strong><\/p>\n

Pokud jste p\u0159ipraveni p\u0159ijmout \u010dervenou pilulku p\u0159etaktov\u00e1n\u00ed, m\u016f\u017eete si bez obav st\u00e1hnout a pou\u017e\u00edt soubory zve\u0159ejn\u011bn\u00e9 n\u011bmeck\u00fdm zdrojem igor’sLAB, \u2014 pro z\u00e1kladn\u00ed verzi. Radeon RX 5700<\/a><\/noindex> a pro XT<\/a><\/noindex>Obsahuj\u00ed v nich registry Windows s programov\u00fdmi tabulkami PowerPlay, kter\u00e9 ur\u010duj\u00ed po\u010d\u00e1te\u010dn\u00ed hodnoty zaj\u00edmav\u00fdch prom\u011bnn\u00fdch a rozsah, v n\u011bm\u017e je povoleno je regulovat. Tento recept funguje d\u00edky tomu, \u017ee p\u0159i instalaci ovlada\u010de grafick\u00e9 karty AMD se do registru zapisuje kopie tabulky PowerPlay z jej\u00edch BIOS\u016f, ale p\u0159i ka\u017ed\u00e9m dal\u0161\u00edm restartu ovlada\u010d pr\u00e1v\u011b v registru hled\u00e1. Takto byly p\u0159etaktov\u00e1ny desky s \u010dipy Polaris a Vega. A Navi \u2014 navzdory tomu, co AMD sl\u00edbila, \u017ee p\u0159\u00edle\u017eitost zakryje \u2014 nejsou v\u00fdjimkou.<\/p>\n

\"Nov\u00fd<\/p>\n

Pro hacknut\u00ed PowerPlay je nutn\u00e9 importovat do registru jeden z reg-soubor\u016f p\u0159ipraven\u00fdch igor’sLAB a restartovat po\u010d\u00edta\u010d, ale nejprve je vhodn\u00e9 vy\u010distit registr od v\u0161ech z\u00e1znam\u016f souvisej\u00edc\u00edch s grafick\u00fdmi adapt\u00e9ry, kter\u00e9 kdy byly v syst\u00e9mu, pomoc\u00ed programu Display Driver Uninstaller s n\u00e1slednou \u010distou instalac\u00ed ovlada\u010de. Jinak se mus\u00edte ujistit, \u017ee reg-soubor odkazuje na spr\u00e1vn\u00fd kl\u00ed\u010d podle prom\u011bnn\u00e9 DriverDesc, a v p\u0159\u00edpad\u011b pot\u0159eby upravit adresu. Po importu do registru se substitu\u010dn\u00ed tabulka PowerPlay objev\u00ed uvnit\u0159 16bitov\u00e9 prom\u011bnn\u00e9 PP_PhmSoftPowerPlayTable, a pro n\u00e1vrat nastaven\u00ed dan\u00fdch firmwarem desky sta\u010d\u00ed ji vymazat z registru \u2014 bu\u010f ru\u010dn\u011b, nebo pomoc\u00ed. reg-souboru<\/a><\/noindex>.<\/p>\n

\n\"Nov\u00fd<\/p>\n

Nejagresivn\u011bj\u0161\u00ed tabulky pro \u010dipy Navi umo\u017e\u0148uj\u00ed zv\u00fd\u0161it taktovac\u00ed frekvenci grafick\u00e9ho procesoru Radeon RX 5700 XT na 2300 MHz, nap\u011bt\u00ed nap\u00e1jen\u00ed a\u017e na 1,25 V a rezervu v\u00fdkonu na 90 %. V\u0161imn\u011bte si, \u017ee cel\u00fd syst\u00e9m, kter\u00fd registruje spot\u0159ebov\u00e1van\u00fd v\u00fdkon na grafick\u00fdch kart\u00e1ch AMD, je nav\u00e1z\u00e1n na regul\u00e1tor nap\u011bt\u00ed GPU a nezohled\u0148uje spot\u0159ebu ostatn\u00edch komponent\u016f za\u0159\u00edzen\u00ed ani \u00fa\u010dinnost konverze (na rozd\u00edl od karet NVIDIA, kter\u00e9 m\u011b\u0159\u00ed proud na \u0161untech v link\u00e1ch 12 V). V d\u016fsledku toho se posuvn\u00edk dostupn\u00e9ho v\u00fdkonu v programu WattMan vztahuje pouze na grafick\u00fd procesor: p\u0159i provozn\u00edm limitu 180 W umo\u017e\u0148uj\u00ed programov\u00e9 tabulky PowerPlay roz\u0161\u00ed\u0159it jej na 342.<\/p>\n

Z\u00e1kladn\u00ed verze Radeon RX 5700 bude naopak omezena na 2100 MHz na taktovac\u00ed frekvenci j\u00e1dra, nap\u00e1jec\u00edm nap\u011bt\u00ed 2,225 V a v\u00fdkonu grafick\u00e9ho procesoru 285 W (+ 90 %). V obou p\u0159\u00edpadech je povolen\u00fd overclocking \u010dip\u016f GDDR6 a\u017e na 1 GHz, co\u017e odpov\u00edd\u00e1 propustnosti 16 Gb\/s na pin sb\u011brnice. Je \u0161koda, \u017ee zat\u00edm nen\u00ed mo\u017en\u00e9 nahr\u00e1t do Radeon RX 5700 firmware z vy\u0161\u0161\u00edho modelu, aby se dostali do stejn\u00fdch v\u00fdchoz\u00edch podm\u00ednek.<\/p>\n

\"Nov\u00fd<\/p>\n

Limit v\u00fdkonu, kter\u00e9 se staly dostupn\u00e9 pro Radeon RX 5700 a Radeon RX 5700 XT d\u00edky softwarov\u00fdm tabulk\u00e1m PowerPlay, vypadaj\u00ed ohromn\u011b. Samotn\u00e1 AMD povoluje zv\u00fd\u0161en\u00ed nap\u00e1jen\u00ed GPU obou model\u016f pouze na 180 a 270 W. Ale jak p\u0159ekvapiv\u00e9, referen\u010dn\u00ed grafick\u00e9 karty jsou zcela p\u0159ipraveny na tak vysokou spot\u0159ebu energie \u2014 alespo\u0148 co se t\u00fd\u010de regul\u00e1toru nap\u011bt\u00ed. VRM referen\u010dn\u00edch desek zahrnuje 6\u20137 silov\u00fdch stup\u0148\u016f ON Semiconductor FDMF3170 s nomin\u00e1ln\u00edm proudem 70 A na ka\u017ed\u00e9. Tak siln\u00e9 a kvalitn\u00ed komponenty se dosud nach\u00e1zely pouze v GeForce RTX 2080 Ti a Radeon VII. Pro srovn\u00e1n\u00ed: Founders Edition akceler\u00e1tory na \u010dipech TU106 (GeForce RTX 2060, RTX 2060 SUPER a RTX 2070) maj\u00ed pouze \u0161est silov\u00fdch stup\u0148\u016f po 55 A.<\/p>\n

\"Nov\u00fd<\/p>\n

Na\u0161e varov\u00e1n\u00ed v\u0161ak st\u00e1le plat\u00ed. MOSFETy regul\u00e1toru nap\u011bt\u00ed nejsou jedin\u00e1 za\u0159\u00edzen\u00ed na ti\u0161t\u011bn\u00e9 desce, kter\u00e1 podl\u00e9haj\u00ed zv\u00fd\u0161en\u00e9mu zat\u00ed\u017een\u00ed. Zejm\u00e9na to plat\u00ed pro samotn\u00fd grafick\u00fd procesor Navi 10, kter\u00e9mu pro dosa\u017een\u00ed frekvence nad 2 GHz je zapot\u0159eb\u00ed velmi vysok\u00e9ho nap\u00e1jec\u00edho nap\u011bt\u00ed podle standard\u016f 7nm fotolitografie.<\/p>\n

Abychom na \u010dipu Radeon RX 5700 XT nastavili taktovac\u00ed frekvenci na 2160 MHz, museli jsme vyu\u017e\u00edt ve\u0161ker\u00fd rezervn\u00ed potenci\u00e1l nap\u011bt\u00ed, kter\u00e9 v dostupn\u00fdch tabulk\u00e1ch PowerPlay dosahuje a\u017e 1,25 V. Jak Radeon RX 590, tak i Radeon RX Vega 64 s vodn\u00edm chlazen\u00edm (a to jde o \u010dipy vyr\u00e1b\u011bn\u00e9 na 12 a 14 nm) si vysta\u010d\u00ed s ni\u017e\u0161\u00edm nap\u011bt\u00edm. U z\u00e1kladn\u00ed verze Radeon RX 570 jsme u\u017e klidn\u00ed: p\u0159etaktov\u00e1n\u00ed GPU dos\u00e1hlo maxim\u00e1ln\u00ed \u00farovn\u011b 2100 MHz, ale pro udr\u017een\u00ed stability sta\u010d\u00ed v\u00edce n\u00edzk\u00e9 nap\u011bt\u00ed ne\u017e u XT p\u0159i standardn\u00ed frekvenci 2010 MHz \u2014 1,093 V. Co se t\u00fd\u010de pracovn\u00edch parametr\u016f, Radeon RX 5700, zpracovan\u00fd pomoc\u00ed softwarov\u00fdch tabulek PowerPlay, je v podstat\u011b XT s p\u0159etaktov\u00e1n\u00edm, v\u011bt\u0161\u00edmi rezervami energie a undervoltingem.<\/p>\n\n\n\n
\n\"Nov\u00fd<\/p>\n<\/td>\n <\/td>\n\n\"Nov\u00fd<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

P\u0159etaktov\u00e1n\u00ed pam\u011bti GDDR6 na obou desk\u00e1ch a\u017e na 1000 MHz se uk\u00e1zalo jako nemo\u017en\u00e9. U star\u0161\u00ed modelu se \u010dipy Samsung K4Z80325BC-H14 dokonce bylo nutn\u00e9 se vzd\u00e1t dosa\u017een\u00fdch v\u00fdsledk\u016f z hlavn\u00edho p\u0159ehledu novinek a spokojit se s v\u00fdslednou p\u0159enosovou kapacitou 14,4 Gb\/s. Radeon RX 5700 naopak umo\u017enil lep\u0161\u00ed p\u0159etaktov\u00e1n\u00ed pam\u011bti (\u010dipy Micron 9GA77 D9WCW) ne\u017e d\u0159\u00edve \u2013 a\u017e na 14,8 Gb\/s. Vypad\u00e1 to, \u017ee u t\u00e9to karty byly skute\u010dn\u011b probl\u00e9my s mont\u00e1\u017e\u00ed chlazen\u00ed.<\/p>\n

Kl\u00ed\u010dov\u00fdm faktorem pro odv\u00e1\u017en\u00e9 experimenty s \u010dipy Navi je zv\u00fd\u0161en\u00e9 chlazen\u00ed. V budoucnu tuto ot\u00e1zku vy\u0159e\u0161\u00ed partne\u0159i AMD, ale zat\u00edm m\u00e1me k dispozici pouze referen\u010dn\u00ed grafick\u00e9 karty, tak\u017ee budeme muset jednodu\u0161e spustit turb\u00ednu na maxim\u00e1ln\u00ed ot\u00e1\u010dky \u2013 to je jedin\u00fd zp\u016fsob, jak udr\u017eet teplotu v nejteplej\u0161\u00edm bod\u011b j\u00e1dra (Junction Temperature), na kterou se automatika grafick\u00e9 karty orientuje, v rozmez\u00ed 110 \u00b0C, po kter\u00e9m dojde k havarijn\u00edmu sn\u00ed\u017een\u00ed taktovac\u00edch frekvenc\u00ed.<\/p>\n

A tak\u00e9 by nebylo na \u0161kodu, kdyby m\u011bla referen\u010dn\u00ed karta v\u00edce vzduchu pro pam\u011b\u0165. Na rozd\u00edl od v\u011bt\u0161iny akceler\u00e1tor\u016f NVIDIA poskytuje Radeon RX 5700 (XT) p\u0159es API hodnoty teplotn\u00edch senzor\u016f GDDR6, kter\u00e9 lze sledovat v GPU-Z a overclockingov\u00fdch utilit\u00e1ch. I p\u0159i standardn\u00edm nastaven\u00ed se pam\u011b\u0165 zah\u0159\u00edv\u00e1 na 78\u201382 \u00b0C, co\u017e je ji\u017e dost vysok\u00e1 teplota \u2013 alespo\u0148 pro \u010dipy Micron, kter\u00e9 jsou navr\u017eeny na provoz v podm\u00ednk\u00e1ch do 95 \u00b0C (specifikace Samsung nejsou ve\u0159ejn\u011b dostupn\u00e9). O regul\u00e1tor nap\u011bt\u00ed se nen\u00ed pot\u0159eba ob\u00e1vat. Nap\u00e1jec\u00ed sekce FDMF3170 m\u00e1 tak vynikaj\u00edc\u00ed \u00fa\u010dinnost, \u017ee teplota pod z\u00e1t\u011b\u017e\u00ed nep\u0159esahuje 68 \u00b0C na desce XT a 63 \u00b0C v 'b\u011b\u017en\u00e9m' Radeon RX 5700 \u2013 a to, i p\u0159esto, \u017ee v cel\u00e9m syst\u00e9mu chlazen\u00ed GPU vlastn\u011b zah\u0159\u00edv\u00e1 vlastn\u00ed VRM, nikoli naopak.<\/p>\n\n\n\n
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\"Nov\u00fd<\/p>\n<\/td>\n

 <\/td>\n\n

\"Nov\u00fd<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u2b07<\/a><\/noindex>#<\/a><\/noindex>Undervolting<\/strong><\/h2>\n

V p\u016fvodn\u00edm p\u0159ehledu Radeon RX 5700 a Radeon RX 5700 XT jsme si ji\u017e v\u0161imli, \u017ee na obou desk\u00e1ch grafick\u00e9 procesory funguj\u00ed s nadbyte\u010dn\u00fdm nap\u011bt\u00edm. Zd\u00e1 se, \u017ee AMD op\u011bt cht\u011bla zv\u00fd\u0161it v\u00fdkon \u010dip\u016f za jakoukoli cenu p\u0159ed uveden\u00edm na trh a zajistila si vy\u0161\u0161\u00ed nap\u011bt\u00ed kv\u016fli nevyhnuteln\u00fdm variac\u00edm v kvalit\u011b k\u0159em\u00edku. Kdysi, v dob\u011b Radeon RX 480, firma slibovala sn\u00ed\u017een\u00ed nadbyte\u010dn\u00e9ho nap\u011bt\u00ed, aby zbyte\u010dn\u011b nezah\u0159\u00edvala vzduch. Dokonce m\u00e1me diapozitivy z roku 2016 s t\u011bmito prohl\u00e1\u0161en\u00edmi.<\/p>\n

\"Nov\u00fd<\/p>\n

Na\u0161t\u011bst\u00ed to, co neud\u011blali in\u017een\u00fd\u0159i AMD, si m\u016f\u017ee z\u00e1kazn\u00edk grafick\u00e9 karty splnit s\u00e1m. P\u0159i prvn\u00edch pokusech o undervolting Radeon RX 5700 a Radeon RX 5700 XT jsme se sna\u017eili neztratit ani jedno FPS ve hr\u00e1ch a u\u017e jsme tehdy dos\u00e1hli v\u00fdrazn\u00e9ho sn\u00ed\u017een\u00ed spot\u0159ebovan\u00e9 energie. Ale hluk referen\u010dn\u00edho chladic\u00edho syst\u00e9mu n\u00e1s nut\u00ed jednat aktivn\u011bji. Abychom na\u0161li zlatou st\u0159edn\u00ed cestu mezi v\u00fdkonem a spot\u0159ebou, vr\u00e1t\u00edme Navi na optim\u00e1ln\u00ed pozici k\u0159ivky energetick\u00e9 \u00fa\u010dinnosti, mus\u00edme sni\u017eovat spolu s nap\u011bt\u00edm nap\u00e1jen\u00ed maxim\u00e1ln\u00ed frekvence GPU. U Radeon RX 5700 XT jsme sn\u00ed\u017eili maxim\u00e1ln\u00ed frekvenci j\u00e1dra z 2010 na 1860, a nap\u011bt\u00ed nap\u00e1jen\u00ed z 1,193 na 0,991 V. Samoz\u0159ejm\u011b, \u017ee ur\u010dit\u00e9 ztr\u00e1ty v\u00fdkonu v tomto p\u0159\u00edpad\u011b jsou nevyhnuteln\u00e9, ale rozhodn\u011b ne takov\u00e9, jak by se dalo p\u0159edpokl\u00e1dat podle maxim\u00e1ln\u00edch frekvenc\u00ed, o tom se je\u0161t\u011b ujist\u00edme.<\/p>\n

Standardn\u00ed parametry ni\u017e\u0161\u00ed verze Radeon RX 5700 jsou ji\u017e bl\u00edzko komfortn\u00ed z\u00f3n\u011b \u010dipu Navi, ale dal\u0161\u00ed optimalizace je st\u00e1le mo\u017en\u00e1. Abychom sn\u00ed\u017eili nap\u011bt\u00ed GPU z 0,979 na 0,839 V, sta\u010d\u00ed se zastavit na maxim\u00e1ln\u00ed frekvenci 1700 MHz m\u00edsto p\u016fvodn\u00edch 1750.<\/p>\n\n\n\n
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\"Nov\u00fd<\/p>\n<\/td>\n

 <\/td>\n\n

\"Nov\u00fd<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u2b07<\/a><\/noindex>#<\/a><\/noindex>Frekvence p\u0159i z\u00e1t\u011b\u017ei, spot\u0159eba energie, teplota, hladina hluku<\/strong><\/h2>\n

Soud\u011b podle p\u0159edb\u011b\u017en\u00fdch m\u011b\u0159en\u00ed v Crysis 3 a pracovn\u00edch parametr\u016f v modern\u00edch hr\u00e1ch, software PowerPlay odvedl svou pr\u00e1ci. Se st\u0159edn\u00ed frekvenc\u00ed GPU 1864 MHz, kterou Radeon RX 5700 XT udr\u017euje v 12 testovan\u00fdch hr\u00e1ch, vy\u0161plhal vy\u0161\u0161\u00ed Navi na 2100 MHz a okam\u017eit\u00e1 frekvence dosahuje a\u017e 2141 MHz. Rozd\u00edl v taktech se pohybuje v rozmez\u00ed 153 a 305 MHz v z\u00e1vislosti na konkr\u00e9tn\u00ed aplikaci a v relativn\u00edm vyj\u00e1d\u0159en\u00ed \u010din\u00ed 8\u201317 %.<\/p>\n

Ale jak se dalo o\u010dek\u00e1vat, ve\u0161ker\u00e1 energetick\u00e1 \u00fa\u010dinnost Navi p\u0159i takov\u00e9m p\u0159etaktov\u00e1n\u00ed vzlet\u011bla do vzduchu. \u010cip prakticky neust\u00e1le pracuje pod otev\u0159en\u011b d\u011bsiv\u00fdm nap\u011bt\u00edm 1,245 V (takov\u00e9 nap\u011bt\u00ed bylo je\u0161t\u011b p\u0159ed sedmi lety pot\u0159ebn\u00e9 pro p\u0159etaktov\u00e1n\u00ed grafick\u00fdch procesor\u016f Tahiti, postaven\u00fdch podle normy 28 nm), a spot\u0159ebovan\u00e1 energie v Crysis 3 dos\u00e1hla 325 m\u00edsto 222 W v norm\u00e1ln\u00edm re\u017eimu. Nen\u00ed divu, \u017ee jsme spustili referen\u010dn\u00ed turb\u00ednu na maxim\u00e1ln\u00edch ot\u00e1\u010dk\u00e1ch: teplota GPU podle okrajov\u00e9ho senzoru dokonce klesla z 80 na 77 \u00b0C, a teplota \u010dip\u016f GDDR6 klesla z 82 na 78 \u00b0C. Ale index teploty hork\u00fdch bod\u016f (Junction Temperature) i tak vzrostl z 92 na 101 \u00b0C \u2014 m\u00e1me na dosah 110 \u00b0C, po kter\u00e9 za\u010d\u00edn\u00e1 automatick\u00e9 throttling.<\/p>\n

Hluk chladic\u00edho syst\u00e9mu, kter\u00fd pracuje rychlost\u00ed kolem 4500 ot\u00e1\u010dek\/min, a\u010dkoli pot\u011b\u0161\u00ed u\u0161i prav\u00e9ho overclockera, je pro st\u00e1l\u00fd provoz zcela nep\u0159ijateln\u00fd. P\u0159etaktovan\u00fd Radeon RX 5700 XT evidentn\u011b pot\u0159ebuje siln\u011bj\u0161\u00ed chladi\u010d \u2013 ide\u00e1ln\u011b n\u011bco t\u0159\u00edslotov\u00e9ho s n\u011bkolika ventil\u00e1tory, a je\u0161t\u011b l\u00e9pe vodn\u00ed chlazen\u00ed. Na\u0161t\u011bst\u00ed se vodn\u00ed bloky pro referen\u010dn\u00ed desky ji\u017e objevily v prodeji.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Pracovn\u00ed parametry pod z\u00e1t\u011b\u017e\u00ed (Crysis 3)<\/th>\n<\/tr>\n
Grafick\u00e1 karta<\/td>\nNastaven\u00ed<\/td>\nFrekvence GPU, MHz<\/td>\nNap\u011bt\u00ed GPU, V<\/td>\nOt\u00e1\u010dky ventil\u00e1tor\u016f, ot.\/min (% z max.)<\/td>\n<\/tr>\n
Pr\u016fm.<\/td>\nMax.<\/td>\nLimit<\/td>\nPr\u016fm.<\/td>\nMax.<\/td>\nPr\u016fm.<\/td>\n<\/tr>\n
AMD Radeon RX 5700 XT (2010\/14000 MHz, 8 GB)<\/td>\nTepeln\u00e1 pasta ARCTIC MX-2<\/td>\n1816<\/td>\n1833<\/td>\n2010<\/td>\n1,083<\/td>\n1,193<\/td>\n2100 (43%)<\/td>\n<\/tr>\n
AMD Radeon RX 5700 XT (1860\/14000 MHz, 8 GB) UV<\/td>\nTepeln\u00e1 pasta ARCTIC MX-2, -201 mV vCore<\/td>\n1807<\/td>\n1812<\/td>\n1860<\/td>\n0,993<\/td>\n0,993<\/td>\n1836 (38%)<\/td>\n<\/tr>\n
AMD Radeon RX 5700 XT (2160\/14400 MHz, 8 GB)<\/td>\nTepeln\u00e1 pasta ARCTIC MX-2, +58 mV vCore<\/td>\n2100<\/td>\n2106<\/td>\n2160<\/td>\n1,245<\/td>\n1,250<\/td>\n4533 (100%)<\/td>\n<\/tr>\n
AMD Radeon RX 5700 (1750\/14000 MHz, 8 GB)<\/td>\nTepeln\u00e1 pasta ARCTIC MX-2<\/td>\n1652<\/td>\n1665<\/td>\n1750<\/td>\n0,952<\/td>\n0,981<\/td>\n1535 (32%)<\/td>\n<\/tr>\n
AMD Radeon RX 5700 (1700\/14000 MHz, 8 GB) UV<\/td>\nTepeln\u00e1 pasta ARCTIC MX-2, -140 mV vCore<\/td>\n1637<\/td>\n1641<\/td>\n1701<\/td>\n0,843<\/td>\n0,843<\/td>\n1263 (26%)<\/td>\n<\/tr>\n
AMD Radeon RX 5700 (2100\/14800 MHz, 8 GB)<\/td>\nTepeln\u00e1 pasta ARCTIC MX-2, +113 mV vCore<\/td>\n2033<\/td>\n2037<\/td>\n2100<\/td>\n1,093<\/td>\n1,093<\/td>\n4473 (100%)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Pozn.:<\/strong> m\u011b\u0159en\u00ed v\u0161ech parametr\u016f se prov\u00e1d\u00ed po zah\u0159\u00e1t\u00ed GPU a stabilizaci taktovac\u00edch frekvenc\u00ed.<\/p>\n

Z\u00e1kladn\u00ed model Radeon RX 5700 d\u00edky programov\u00fdm tabulk\u00e1m PowerPlay dos\u00e1hl je\u0161t\u011b lep\u0161\u00edch taktu a v kombinaci s ostatn\u00edmi parametry vypad\u00e1 \u017eivotaschopn\u011bji. M\u00edsto pr\u016fm\u011brn\u00e9 stabiln\u00ed frekvence 1683 MHz v testovac\u00edch hr\u00e1ch jsme dos\u00e1hli 2053, a rozd\u00edl mezi takty v p\u0159etaktov\u00e1n\u00ed a standardn\u00edm re\u017eimu se pohybuje od 325 do 353 MHz (19\u201321 %). P\u0159etaktovan\u00fd RX 5700 dosahuje vy\u0161\u0161\u00edch takt\u016f ne\u017e standardn\u00ed XT, ale nap\u011bt\u00ed z\u016fst\u00e1v\u00e1 prakticky stejn\u00e9 \u2013 1,093 V. N\u00e1r\u016fst v\u00fdkonu ze 187 na 250 W nen\u00ed samoz\u0159ejm\u011b \u017e\u00e1dn\u00e1 radostn\u00e1 zpr\u00e1va, ale pokud porovn\u00e1me ob\u011b grafick\u00e9 karty v p\u0159etaktov\u00e1n\u00ed, star\u0161\u00ed model vyhr\u00e1v\u00e1 pouze o 72 MHz v pr\u016fm\u011brn\u00fdch hern\u00edch frekvenc\u00edch, ale spot\u0159ebov\u00e1v\u00e1 o 75 W v\u00edce. Tak na jak\u00e9 ob\u011bti se ka\u017ed\u00fd megahertz prom\u011bn\u00ed, kdy\u017e \u010dip pracuje bl\u00edzko sv\u00fdch frekven\u010dn\u00edch limit\u016f. Pro Navi 10 z\u00f3na rychle klesaj\u00edc\u00edho zisku za\u010d\u00edn\u00e1 p\u0159ibli\u017en\u011b u 2 GHz, a v\u0161e, co je nad 2,1 GHz, p\u0159edstavuje sp\u00ed\u0161e akademick\u00fd ne\u017e praktick\u00fd z\u00e1jem.<\/p>\n

V\u0161imn\u011bme si, \u017ee tak\u00e9 u grafick\u00fdch karet NVIDIA se p\u0159etaktov\u00e1n\u00ed zasek\u00e1v\u00e1 na \u00farovni t\u011bsn\u011b nad 2 GHz p\u0159i nap\u011bt\u00ed srovnateln\u00e9m s Radeon RX 5700, a\u010dkoli \u010dipy Turing nemaj\u00ed tak jemnou fotolitografii jako 7nm Navi. Nicm\u00e9n\u011b zv\u00fd\u0161en\u00ed hustoty tranzistor\u016f, kter\u00e9 zajistil nov\u00fd v\u00fdrobcovsk\u00fd proces TSMC, je\u0161t\u011b neznamen\u00e1, \u017ee nap\u00e1jec\u00ed nap\u011bt\u00ed (zejm\u00e9na mimo typick\u00e9 pracovn\u00ed podm\u00ednky) mus\u00ed b\u00fdt v\u017edy ni\u017e\u0161\u00ed.<\/p>\n

\"Nov\u00fd<\/p>\n

Pozn.: <\/strong>V\u00fdkon grafick\u00fdch karet je m\u011b\u0159en odd\u011blen\u011b od CPU a dal\u0161\u00edch komponent\u016f PC pomoc\u00ed amp\u00e9rmetru JUNTEK VAT-1050. Aby bylo mo\u017en\u00e9 z\u00e1rove\u0148 zm\u011b\u0159it proud, kter\u00fd proch\u00e1z\u00ed konektory dopl\u0148kov\u00e9ho nap\u00e1jen\u00ed a slotem z\u00e1kladn\u00ed desky, grafick\u00e1 karta je p\u0159ipojena p\u0159es tvrd\u00fd riser PCI Express x16, ve kter\u00e9m jsou nap\u00e1jec\u00ed linky p\u0159eru\u0161eny a vyvedeny na samostatn\u00fd kabel.<\/p>\n

Zes\u00edlen\u00e9 chlazen\u00ed p\u0159i maxim\u00e1ln\u00edch ot\u00e1\u010dk\u00e1ch turb\u00edny nen\u00ed pro p\u0159etaktov\u00e1n\u00ed Radeon RX 5700 tak nal\u00e9hav\u011b nutn\u00e9 jako v p\u0159\u00edpad\u011b XT a bylo pot\u0159eba sp\u00ed\u0161e pro jednoduchou jistotu, abychom se vyhnuli throttlingu. V testu Crysis 3 klesla maxim\u00e1ln\u00ed teplota GPU podle okrajov\u00e9ho senzoru z 81 na 66 \u00b0C, Junction Temperature z\u016fstala na \u00farovni 79\u201380, zat\u00edmco \u010dipy GDDR6 se nep\u0159eh\u0159\u00edvaly nad 72 \u00b0C. A\u010dkoli pro trval\u00fd provoz p\u0159etaktovan\u00e9ho Radeon RX 5700 pod referen\u010dn\u00edm chladic\u00edm syst\u00e9mem nen\u00ed nezbytn\u00e9 sn\u00e1\u0161et rev turb\u00edny b\u011b\u017e\u00edc\u00ed na \u00farovni 4,5 tis. ot\/min, n\u011bjak\u00e9 manipulace s k\u0159ivkou \u0159\u00edzen\u00ed ventil\u00e1toru budou p\u0159esto pot\u0159eba (nakonec spot\u0159ebov\u00e1v\u00e1 o 14 % v\u00edce energie ne\u017e XT v norm\u00e1ln\u00edm re\u017eimu). Z \u010dist\u00e9 zv\u011bdavosti jsme spustili Crysis 3 na Radeon RX 5700 s p\u0159etaktov\u00e1n\u00edm a zv\u00fd\u0161enou rezervou v\u00fdkonu bez jak\u00fdchkoli zm\u011bn v automatizaci chladic\u00edho syst\u00e9mu, nicm\u00e9n\u011b to m\u011blo \u0161patn\u00fd v\u00fdsledek: grafick\u00fd procesor se pom\u011brn\u011b rychle zah\u0159\u00e1l na 90 \u00b0C podle okrajov\u00e9ho senzoru a na 107 ve hork\u00e9m bod\u011b. \u010cipy RAM p\u0159ekro\u010dily vypo\u010dten\u00e9 parametry s teplotou 98 \u00b0C, a v d\u016fsledku toho opera\u010dn\u00ed syst\u00e9m zamrzl bez mo\u017enosti obnovit procesy ovlada\u010de grafick\u00e9 karty \u2013 jak obvykle b\u00fdv\u00e1 p\u0159i selh\u00e1n\u00ed opera\u010dn\u00ed pam\u011bti GPU.<\/p>\n

\"Nov\u00fd<\/p>\n

Ob\u011b grafick\u00e9 karty pro\u0161ly undervoltingem s p\u0159ijateln\u00fdmi ztr\u00e1tami v taktech. Maxim\u00e1ln\u00ed frekvenci j\u00e1dra u Radeon RX 5700 XT jsme sn\u00ed\u017eili o 200 MHz, ale jen ve t\u0159ech z dvan\u00e1cti testovan\u00fdch her pr\u016fm\u011brn\u00e9 frekvence klesly o v\u00edce ne\u017e 100 MHz. Rozd\u00edl se pohybuje od \u2013142 do +11 MHz (n\u011bkdy undervolting zp\u016fsob\u00ed automatick\u00e9 p\u0159etaktov\u00e1n\u00ed v r\u00e1mci standardn\u00edho TDP), a pr\u016fm\u011brn\u00e1 delta \u010din\u00ed 64 MHz (3 % od standardn\u00ed \u00farovn\u011b). Pouze pr\u016fm\u011brn\u00e1 \u0161pi\u010dkov\u00e1 frekvence klesla okam\u017eit\u011b o 107 MHz. Na\u0161t\u011bst\u00ed jsme tak\u00e9 sn\u00ed\u017eili spot\u0159ebovanou energii grafick\u00e9 karty p\u0159i ni\u017e\u0161\u00edm nap\u011bt\u00ed a taktech z 219 na 191 W. \u0160koda, \u017ee to m\u011blo slab\u00fd vliv na teplotu GPU \u2013 rozd\u00edl je 3 \u00b0C, a ventil\u00e1tor st\u00e1le funguje pom\u011brn\u011b hlasit\u011b: na \u00farovni z\u00e1kladn\u00edho modelu RX 5700 v norm\u00e1ln\u00edm re\u017eimu.<\/p>\n

Sn\u00ed\u017een\u00ed taktu Radeon RX 5700 pod z\u00e1t\u011b\u017e\u00ed je je\u0161t\u011b m\u00e9n\u011b patrn\u00e9 ne\u017e u XT. Pr\u016fm\u011brn\u00e1 frekvence GPU ve hr\u00e1ch klesla o 35\u201361 MHz (3 %), zat\u00edmco maxim\u00e1ln\u00ed poklesla o 43 MHz. Hlavn\u00ed v\u0161ak je, \u017ee v\u00fdkon RX 5700 pod z\u00e1t\u011b\u017e\u00ed v Crysis 3 nyn\u00ed \u010din\u00ed ji\u017e 157 W nam\u00edsto 187 W: dokonce i GeForce RTX 2060 SUPER spot\u0159ebov\u00e1v\u00e1 v\u00edce. Co se t\u00fd\u010de chladic\u00edho syst\u00e9mu, tam u\u017e nen\u00ed co vytknout: teplota GPU z\u016fstala stejn\u00e1 a hladina hluku je ni\u017e\u0161\u00ed ne\u017e u z\u00e1kladn\u00edch model\u016f Founders Edition.<\/p>\n

\"Nov\u00fd<\/p>\n

\u2b07<\/a><\/noindex>#<\/a><\/noindex>V\u00fdkon po p\u0159etaktov\u00e1n\u00ed a undervoltingu<\/strong><\/h2>\n

Pro hodnocen\u00ed hern\u00edho v\u00fdkonu jsme se omezili na testy p\u0159i rozli\u0161en\u00ed 1440p: v tomto re\u017eimu Radeon RX 5700 a RX 5700 XT u\u017e nar\u00e1\u017e\u00ed na v\u00fdkon procesoru, a ve 4K p\u0159i maxim\u00e1ln\u00edch nastaven\u00edch grafick\u00e9 kvality \u010dasto dosa\u017een\u00fd sn\u00edmkov\u00fd tarif neumo\u017e\u0148uje srovn\u00e1n\u00ed v\u00fdsledk\u016f s po\u017eadovanou p\u0159esnost\u00ed. A jak jste u\u017e mohli z n\u00e1znak\u016f v teoretick\u00e9 \u010d\u00e1sti recenze pochopit, p\u0159etaktov\u00e1n\u00ed \u010dip\u016f Navi nep\u0159ineslo v\u00fdsledky, na kter\u00e9 by se dalo spol\u00e9hat na z\u00e1klad\u011b \u010dist\u00fdch frekvenc\u00ed.<\/p>\n

Radeon RX 5700 XT, i p\u0159es pr\u016fm\u011brn\u00fd n\u00e1r\u016fst frekvence GPU o 13 % (a v\u00fdkonu o 106 W), z\u00edskal pouze 5 % dodate\u010dn\u00fdch FPS. A pokud analyzujeme parametry ve jednotliv\u00fdch hr\u00e1ch, v pr\u016fm\u011bru pouze 44 % teoretick\u00e9ho v\u00fdkonu, kter\u00fd dal overclocking, na\u0161lo v\u00fdraz v testovac\u00edch v\u00fdsledc\u00edch. Co je hor\u0161\u00ed, minim\u00e1ln\u00ed sn\u00edmkov\u00e1 frekvence m\u011b\u0159en\u00e1 1. percentilov\u00fdm rozlo\u017een\u00edm doby sn\u00edmku v n\u011bkolika hr\u00e1ch dokonce klesla. U overclockingu Navi n\u011bco zjevn\u011b nevy\u0161lo, ale v jedn\u00e9 v\u011bci si jsme jisti \u2014 co se t\u00fd\u010de spot\u0159eby energie, to je z\u0159ejm\u00e9. Hlavn\u00edm d\u016fvodem, kter\u00fd by mohl vysv\u011btlit zklam\u00e1n\u00ed z v\u00fdsledk\u016f, je nedostatek \u0161\u00ed\u0159ky p\u00e1sma opera\u010dn\u00ed pam\u011bti (memory bandwidth), proto\u017ee u slab\u0161\u00ed verze je v\u00fdkon t\u011bsn\u011bji korelov\u00e1n s frekvencemi.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nAMD Radeon RX 5700 XT (2010\/14000 MHz, 8 GB)<\/th>\nAMD Radeon RX 5700 XT (2160\/14400 MHz, 8 GB)<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence GPU, MHz<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence sn\u00edmk\u016f<\/th>\n<\/tr>\n
Pr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\nPr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\n<\/tr>\n
Ashes of the Singularity: Escalation<\/td>\n1 801<\/td>\n1 913<\/td>\n2 104<\/td>\n2 125<\/td>\n+302 (17%)<\/td>\n+2%<\/td>\n<\/tr>\n
Assassin's Creed Odyssey<\/td>\n1 955<\/td>\n1 970<\/td>\n2 108<\/td>\n2 117<\/td>\n+153 (8%)<\/td>\n+2%<\/td>\n<\/tr>\n
Battlefield V<\/td>\n1 893<\/td>\n1 919<\/td>\n2 078<\/td>\n2 118<\/td>\n+184 (10%)<\/td>\n+6%<\/td>\n<\/tr>\n
DiRT Rally 2.0<\/td>\n1 848<\/td>\n1 883<\/td>\n2 105<\/td>\n2 131<\/td>\n+257 (14%)<\/td>\n+11%<\/td>\n<\/tr>\n
Far Cry 5<\/td>\n1 790<\/td>\n1 915<\/td>\n2 094<\/td>\n2 115<\/td>\n+305 (17%)<\/td>\n+7%<\/td>\n<\/tr>\n
Final Fantasy XV<\/td>\n1 889<\/td>\n2 014<\/td>\n2 109<\/td>\n2 141<\/td>\n+220 (12%)<\/td>\n+8%<\/td>\n<\/tr>\n
GTA V<\/td>\n1 926<\/td>\n1 954<\/td>\n2 094<\/td>\n2 111<\/td>\n+168 (9%)<\/td>\n+6%<\/td>\n<\/tr>\n
Metro Exodus<\/td>\n1 824<\/td>\n1 906<\/td>\n2 094<\/td>\n2 114<\/td>\n+270 (15%)<\/td>\n+5%<\/td>\n<\/tr>\n
Shadow of the Tomb Raider<\/td>\n1 892<\/td>\n1 960<\/td>\n2 106<\/td>\n2 133<\/td>\n+215 (11%)<\/td>\n+2%<\/td>\n<\/tr>\n
Strange Brigade<\/td>\n1 865<\/td>\n1 911<\/td>\n2 101<\/td>\n2 114<\/td>\n+236 (13%)<\/td>\n+8%<\/td>\n<\/tr>\n
Tom Clancy's The Division 2<\/td>\n1 815<\/td>\n1 852<\/td>\n2 099<\/td>\n2 128<\/td>\n+284 (16%)<\/td>\n+3%<\/td>\n<\/tr>\n
Total War: WARHAMMER II<\/td>\n1 868<\/td>\n1 922<\/td>\n2 107<\/td>\n2 135<\/td>\n+239 (13%)<\/td>\n+3%<\/td>\n<\/tr>\n
Max.<\/td>\n1 955<\/td>\n2 014<\/td>\n2 109<\/td>\n2 141<\/td>\n+305 (17%)<\/td>\n+11%<\/td>\n<\/tr>\n
Pr\u016fm.<\/td>\n1 864<\/td>\n1 927<\/td>\n2 100<\/td>\n2 124<\/td>\n+236 (13%)<\/td>\n+5%<\/td>\n<\/tr>\n
Min.<\/td>\n1 790<\/td>\n1 852<\/td>\n2 078<\/td>\n2 111<\/td>\n+153 (8%)<\/td>\n+2%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Radeon RX 5700 dos\u00e1hl p\u0159i overclockingu 13 % zv\u00fd\u0161en\u00ed sn\u00edmkov\u00e9ho v\u00fdkonu p\u0159i pr\u016fm\u011brn\u00e9m n\u00e1r\u016fstu takt\u016f o 21 % \u2014 ji\u017e 63 % dodate\u010dn\u00e9ho v\u00fdpo\u010detn\u00edho v\u00fdkonu se dostalo do benchmark\u016f. Je t\u0159eba poznamenat, \u017ee opera\u010dn\u00ed pam\u011b\u0165 Micron na desce RX 5700 se p\u0159etaktovala l\u00e9pe ne\u017e \u010dipy Samsung u Radeon RX 5700 XT (14,8 proti 14,4 Gb\/s), ale \u0161patn\u00e9 \u0161k\u00e1lov\u00e1n\u00ed FPS u vlajkov\u00e9 lodi Navi sotva lze p\u0159i\u010d\u00edst na vrub rozd\u00edlu 3 % v \u0161\u00ed\u0159ce p\u00e1sma. Nap\u0159\u00edklad u Radeon VII, v\u00fdkon roste<\/a><\/noindex> prakticky v pom\u011bru 1:1 s taktovac\u00edmi frekvencemi GPU, nebo\u0165 propustnost \u010dty\u0159 stack\u016f HBM2 je mnohem vy\u0161\u0161\u00ed ve srovn\u00e1n\u00ed s 256-bitovou sb\u011brnic\u00ed GDDR6, a p\u0159etaktov\u00e1vaj\u00ed se docela dob\u0159e.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nAMD Radeon RX 5700 (1750\/14000 MHz, 8 GB)<\/th>\nAMD Radeon RX 5700 (2100\/14800 MHz, 8 GB)<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence GPU, MHz<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence sn\u00edmk\u016f<\/th>\n<\/tr>\n
Pr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\nPr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\n<\/tr>\n
Ashes of the Singularity: Escalation<\/td>\n1 672<\/td>\n1 696<\/td>\n2 026<\/td>\n2 057<\/td>\n+353 (21%)<\/td>\n+14%<\/td>\n<\/tr>\n
Assassin's Creed Odyssey<\/td>\n1 695<\/td>\n1 703<\/td>\n2 039<\/td>\n2 049<\/td>\n+344 (20%)<\/td>\n+14%<\/td>\n<\/tr>\n
Battlefield V<\/td>\n1 673<\/td>\n1 684<\/td>\n1 998<\/td>\n2 021<\/td>\n+325 (19%)<\/td>\n+10%<\/td>\n<\/tr>\n
DiRT Rally 2.0<\/td>\n1 687<\/td>\n1 695<\/td>\n2 033<\/td>\n2 039<\/td>\n+346 (21%)<\/td>\n+14%<\/td>\n<\/tr>\n
Far Cry 5<\/td>\n1 676<\/td>\n1 687<\/td>\n2 022<\/td>\n2 049<\/td>\n+346 (21%)<\/td>\n+9%<\/td>\n<\/tr>\n
Final Fantasy XV<\/td>\n1 692<\/td>\n1 719<\/td>\n2 040<\/td>\n2 075<\/td>\n+348 (21%)<\/td>\n+16%<\/td>\n<\/tr>\n
GTA V<\/td>\n1 683<\/td>\n1 695<\/td>\n2 026<\/td>\n2 038<\/td>\n+343 (20%)<\/td>\n+12%<\/td>\n<\/tr>\n
Metro Exodus<\/td>\n1 669<\/td>\n1 693<\/td>\n2 018<\/td>\n2 041<\/td>\n+349 (21%)<\/td>\n+13%<\/td>\n<\/tr>\n
Shadow of the Tomb Raider<\/td>\n1 690<\/td>\n1 700<\/td>\n2 036<\/td>\n2 046<\/td>\n+346 (20%)<\/td>\n+14%<\/td>\n<\/tr>\n
Strange Brigade<\/td>\n1 684<\/td>\n1 694<\/td>\n2 031<\/td>\n2 057<\/td>\n+347 (21%)<\/td>\n+12%<\/td>\n<\/tr>\n
Tom Clancy's The Division 2<\/td>\n1 678<\/td>\n1 691<\/td>\n2 031<\/td>\n2 109<\/td>\n+353 (21%)<\/td>\n+13%<\/td>\n<\/tr>\n
Total War: WARHAMMER II<\/td>\n1 689<\/td>\n1 697<\/td>\n2 033<\/td>\n2 049<\/td>\n+344 (20%)<\/td>\n+15%<\/td>\n<\/tr>\n
Max.<\/td>\n1 695<\/td>\n1 719<\/td>\n2 040<\/td>\n2 109<\/td>\n+353 (21%)<\/td>\n+16%<\/td>\n<\/tr>\n
Pr\u016fm.<\/td>\n1 683<\/td>\n1 696<\/td>\n2 028<\/td>\n2 053<\/td>\n+345 (21%)<\/td>\n+13%<\/td>\n<\/tr>\n
Min.<\/td>\n1 669<\/td>\n1 684<\/td>\n1 998<\/td>\n2 021<\/td>\n+325 (19%)<\/td>\n+9%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Nicm\u00e9n\u011b nen\u00ed t\u0159eba se posm\u00edvat Radeon RX 5700 XT a v\u00fdvoj\u00e1\u0159\u016fm AMD kv\u016fli nedostatku RPS u t\u00e9to grafick\u00e9 karty. Pokud vezmeme data z akceler\u00e1tor\u016f NVIDIA z rodiny GeForce RTX 20 a porovn\u00e1me teoretick\u00fd v\u00fdpo\u010detn\u00ed v\u00fdkon s hern\u00edmi FPS, snadno si v\u0161imneme, \u017ee \u010d\u00edm v\u011bt\u0161\u00ed GPU, t\u00edm v\u00edce gigaflop\u016f se ztr\u00e1c\u00ed. Omezen\u00e1 rychlost opera\u010dn\u00ed pam\u011bti mohla hr\u00e1t v tomto v\u00fdznamnou roli, proto\u017ee v\u0161echny modely zalo\u017een\u00e9 na TU106 a TU104, krom\u011b GeForce RTX 2060, maj\u00ed stejnou RAM konfiguraci, a nejv\u011bt\u0161\u00ed skok v pom\u011bru teoretick\u00e9ho v\u00fdkonu a hern\u00edch v\u00fdsledk\u016f se objevuje pr\u00e1v\u011b mezi RTX 2060 a RTX 2060 SUPER: z\u00e1kladn\u00ed model m\u00e1 192bitovou sb\u011brnici, zat\u00edmco SUPER m\u00e1 256bitovou. Nen\u00ed divu, \u017ee NVIDIA ji\u017e za\u010dala vyu\u017e\u00edvat \u010dipy GDDR6 s propustnost\u00ed 16 Gb\/s na desk\u00e1ch GeForce RTX 2080 SUPER.<\/p>\n

Radeon RX 5700 XT pravd\u011bpodobn\u011b jen odhalil probl\u00e9m, se kter\u00fdm se oba v\u00fdrobci grafick\u00fdch procesor\u016f pot\u00fdkaj\u00ed, proto\u017ee \u017e\u00e1dn\u00fd \u010dip NVIDIA nelze tak v\u00fdrazn\u011b p\u0159etaktovat bez hardwarov\u00fdch modifikac\u00ed (pokud nepo\u010d\u00edt\u00e1me 'elitn\u00ed' desky, pro kter\u00e9 vyd\u00e1vaj\u00ed firmware a software pouze na zvl\u00e1\u0161tn\u00ed \u017e\u00e1dost). Nicm\u00e9n\u011b \u010d\u00e1st viny za slzy overclocker\u016f pravd\u011bpodobn\u011b le\u017e\u00ed i na softwarov\u00e9m t\u00fdmu Radeon Technologies Group. Probl\u00e9my s rovnom\u011brn\u00fdm tempem renderingu sn\u00edmk\u016f u Navi existuj\u00ed i p\u0159i standardn\u00edch taktech. Krom\u011b toho je RDNA zcela nov\u00e1 grafick\u00e1 architektura, a vyladit ovlada\u010de p\u0159ed premi\u00e9rou 5000. s\u00e9rie AMD, jak je zvykem u t\u00e9to spole\u010dnosti, se j\u00ed bohu\u017eel nepoda\u0159ilo.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nAMD Radeon RX 5700 XT (2010\/14000 MHz, 8 GB)<\/th>\nAMD Radeon RX 5700 XT (1860\/14000 MHz, 8 GB) UV<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence GPU, MHz<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence sn\u00edmk\u016f<\/th>\n<\/tr>\n
Pr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\nPr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\n<\/tr>\n
Ashes of the Singularity: Escalation<\/td>\n1 801<\/td>\n1 913<\/td>\n1 804<\/td>\n1 819<\/td>\n+3 (0%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Assassin's Creed Odyssey<\/td>\n1 955<\/td>\n1 970<\/td>\n1 813<\/td>\n1 826<\/td>\n-142 (7%)<\/td>\n\u22126%<\/td>\n<\/tr>\n
Battlefield V<\/td>\n1 893<\/td>\n1 919<\/td>\n1 782<\/td>\n1 794<\/td>\n-112 (6%)<\/td>\n\u22124%<\/td>\n<\/tr>\n
DiRT Rally 2.0<\/td>\n1 848<\/td>\n1 883<\/td>\n1 805<\/td>\n1 812<\/td>\n-43 (2%)<\/td>\n0%<\/td>\n<\/tr>\n
Far Cry 5<\/td>\n1 790<\/td>\n1 915<\/td>\n1 801<\/td>\n1 811<\/td>\n+11 (1%)<\/td>\n0%<\/td>\n<\/tr>\n
Final Fantasy XV<\/td>\n1 889<\/td>\n2 014<\/td>\n1 793<\/td>\n1 914<\/td>\n-96 (5%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
GTA V<\/td>\n1 926<\/td>\n1 954<\/td>\n1 796<\/td>\n1 810<\/td>\n-130 (7%)<\/td>\n0%<\/td>\n<\/tr>\n
Metro Exodus<\/td>\n1 824<\/td>\n1 906<\/td>\n1 786<\/td>\n1 805<\/td>\n-38 (2%)<\/td>\n0%<\/td>\n<\/tr>\n
Shadow of the Tomb Raider<\/td>\n1 892<\/td>\n1 960<\/td>\n1 805<\/td>\n1 812<\/td>\n-87 (5%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Strange Brigade<\/td>\n1 865<\/td>\n1 911<\/td>\n1 807<\/td>\n1 815<\/td>\n-58 (3%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Tom Clancy's The Division 2<\/td>\n1 815<\/td>\n1 852<\/td>\n1 799<\/td>\n1 805<\/td>\n-17 (1%)<\/td>\n+2%<\/td>\n<\/tr>\n
Total War: WARHAMMER II<\/td>\n1 868<\/td>\n1 922<\/td>\n1 805<\/td>\n1 812<\/td>\n-63 (3%)<\/td>\n0%<\/td>\n<\/tr>\n
Max.<\/td>\n1 955<\/td>\n2 014<\/td>\n1 813<\/td>\n1 914<\/td>\n+11 (1%)<\/td>\n+2%<\/td>\n<\/tr>\n
Pr\u016fm.<\/td>\n1 864<\/td>\n1 927<\/td>\n1 799<\/td>\n1 820<\/td>\n-64 (3%)<\/td>\n\u22121%<\/td>\n<\/tr>\n
Min.<\/td>\n1 790<\/td>\n1 852<\/td>\n1 782<\/td>\n1 794<\/td>\n-142 (7%)<\/td>\n\u22126%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
<\/th>\nAMD Radeon RX 5700 (1750\/14000 MHz, 8 GB)<\/th>\nAMD Radeon RX 5700 (1700\/14000 MHz, 8 GB) UV<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence GPU, MHz<\/th>\nZm\u011bna pr\u016fm\u011brn\u00e9 frekvence sn\u00edmk\u016f<\/th>\n<\/tr>\n
Pr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\nPr\u016fm\u011brn\u00e1 frekvence GPU, MHz<\/td>\nMaxim\u00e1ln\u00ed frekvence GPU, MHz<\/td>\n<\/tr>\n
Ashes of the Singularity: Escalation<\/td>\n1 672<\/td>\n1 696<\/td>\n1 638<\/td>\n1 653<\/td>\n-35 (2%)<\/td>\n\u22125%<\/td>\n<\/tr>\n
Assassin's Creed Odyssey<\/td>\n1 695<\/td>\n1 703<\/td>\n1 650<\/td>\n1 658<\/td>\n-45 (3%)<\/td>\n+2%<\/td>\n<\/tr>\n
Battlefield V<\/td>\n1 673<\/td>\n1 684<\/td>\n1 629<\/td>\n1 638<\/td>\n-44 (3%)<\/td>\n\u22123%<\/td>\n<\/tr>\n
DiRT Rally 2.0<\/td>\n1 687<\/td>\n1 695<\/td>\n1 641<\/td>\n1 645<\/td>\n-46 (3%)<\/td>\n\u22123%<\/td>\n<\/tr>\n
Far Cry 5<\/td>\n1 676<\/td>\n1 687<\/td>\n1 627<\/td>\n1 641<\/td>\n-49 (3%)<\/td>\n\u22121%<\/td>\n<\/tr>\n
Final Fantasy XV<\/td>\n1 692<\/td>\n1 719<\/td>\n1 639<\/td>\n1 673<\/td>\n-53 (3%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
GTA V<\/td>\n1 683<\/td>\n1 695<\/td>\n1 639<\/td>\n1 650<\/td>\n-44 (3%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Metro Exodus<\/td>\n1 669<\/td>\n1 693<\/td>\n1 629<\/td>\n1 643<\/td>\n-40 (2%)<\/td>\n0%<\/td>\n<\/tr>\n
Shadow of the Tomb Raider<\/td>\n1 690<\/td>\n1 700<\/td>\n1 630<\/td>\n1 651<\/td>\n-61 (4%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Strange Brigade<\/td>\n1 684<\/td>\n1 694<\/td>\n1 642<\/td>\n1 653<\/td>\n-42 (2%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Tom Clancy's The Division 2<\/td>\n1 678<\/td>\n1 691<\/td>\n1 641<\/td>\n1 676<\/td>\n-37 (2%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Total War: WARHAMMER II<\/td>\n1 689<\/td>\n1 697<\/td>\n1 644<\/td>\n1 650<\/td>\n-46 (3%)<\/td>\n\u22124%<\/td>\n<\/tr>\n
Max.<\/td>\n1 695<\/td>\n1 719<\/td>\n1 650<\/td>\n1 676<\/td>\n-35 (2%)<\/td>\n+2%<\/td>\n<\/tr>\n
Pr\u016fm.<\/td>\n1 683<\/td>\n1 696<\/td>\n1 637<\/td>\n1 653<\/td>\n-45 (3%)<\/td>\n\u22122%<\/td>\n<\/tr>\n
Min.<\/td>\n1 669<\/td>\n1 684<\/td>\n1 627<\/td>\n1 638<\/td>\n-61 (4%)<\/td>\n\u22125%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Ale pokud se v\u00fdkon Navi ve hr\u00e1ch tak \u0161patn\u011b \u0161k\u00e1luje s rostouc\u00edmi takty, plat\u00ed to spr\u00e1vn\u011b i obr\u00e1cen\u011b: lze sn\u00ed\u017eit frekvence, ale zachovat v\u00fdkon na stejn\u00e9 \u00farovni. V d\u016fsledku undervoltingu s sn\u00ed\u017een\u00fdmi maxim\u00e1ln\u00edmi frekvencemi ob\u011b modifikace Radeon RX 5700 ztratily pr\u016fm\u011brn\u011b 1\u20132 % FPS, a dokonce v hor\u0161\u00edm p\u0159\u00edpad\u011b pouze 5 %. Tyto skromn\u00e9 ztr\u00e1ty se bohat\u011b vyplat\u00ed za \u00fasporu 28\u201330 W spot\u0159eby a sn\u00ed\u017eenou \u00farove\u0148 hluku.<\/p>\n\n\n\n
\n\"Nov\u00fd<\/p>\n<\/td>\n <\/td>\n\n\"Nov\u00fd<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Zdroj: 3dnews.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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