Among the representatives of the most advanced series of Seasonic PRIME TX power supplies, there are models with power from 650 to 1000 W. Of course, they have the advantage already familiar to us of the previously considered blocks of the series ΠΈ in the form of a dual-mode cooling system, but surpass them in terms of efficiency and manufacturer's warranty. True, it was not possible to fit the filling of these models into a case of standard dimensions: the PRIME series power supplies have a length of 170 mm, which is 30 mm longer than that of the FOCUS series models.
Differences in electrical and acoustic parameters will be shown by practical testing.
Packaging, scope of delivery, appearance
The Seasonic PRIME TX-750 package differs from the Fokus package both in larger sizes and in a more spectacular glossy finish, although the design style is generally close to what we have seen before.
The façade features manufacturer, series, and model names, the 80 PLUS Titanium certification badge, and features such as a fully modular cable system, hybrid fan control, and a record-breaking 12-year warranty.
On one of the sidewalls there are tables with the electrical parameters of the model and available cables and connectors.
The reverse part is divided into two halves: the first is devoted to the efficiency of the model (efficiency graph in 115 and 230 V networks, voltage regulation accuracy within 0,5% over the entire load range), and the second is devoted to the cooling system (description of the hybrid mode operation algorithm and the relative level noise at various loads - at maximum speed, the declared noise is only slightly higher than the background noise at the recording studio).
The scope of delivery is very similar to what we saw in the models of the FOCUS series. It also includes multilingual printed instructions, an installation guide, a chance to register your product for a chance to win $50 to buy games on Steam, a PSU health tester without chassis installation, and a mounting kit complete with disposable and reusable cable ties. The differences come down to the fact that the printed instructions are designed differently, and a sticker on the case of the system unit has been added to the kit.
The power supply and detachable cables are packed in pouches made of velvety fabric, which looks much more impressive and reliable than the nondescript synthetics found in the FOCUS series power supplies.
The power supply case has dimensions of 170 Γ 150 Γ 86 mm, which can somewhat upset the owners of compact cases. The cable system is - and this is expected for a unit of this class - completely modular.
The exterior design is even more impressive than that of the FOCUS series models: side edges with curly cutouts, a two-tone ventilation grille with elongated hexagonal cells, expressive inserts on the sides and top with the name of the PRIME series.
The set of connectors for connecting cables has become more extensive than in the FOCUS series models of the same power: six connectors for CPU/PCI-E power cables and five for SATA/Molex power cables are available (FOCUS series models offered four connectors of each type).
The rear panel is covered with a ventilation grill with cells of the same shape as on the top panel. It contains the power cord input, power switch and button for selecting the operating mode of the cooling system. At the bottom of the case there is a sticker with information about the model, including input and output electrical parameters.
Technical specifications
| Manufacturer | Seasonic |
| Model | PRIME TX-750 (SSR-750TR) |
| Connecting cables | Fully modular |
| Maximum load power, W | 750 |
| 80 Plus Certified | Titanium |
| ATX Version | ATX12V 2.3 |
| Mains parameters | 100-240V, 9,5-4,5A, 50-60Hz |
| Performance | > 94% |
| PFC | Active |
| Load protection | OVP (Over Voltage Protection) |
| OPP (over power protection) | |
| OCP (Over Current Protection) | |
| UVP (mains undervoltage protection) | |
| OTP (Over Temperature Protection) | |
| SCP (short circuit protection) | |
| Dimensions, mm | 170 Γ Γ 150 86 |
| Weight, kg | ND |
| Time between failures (MTBF), h | 150 at 000Β° C (25 at 50Β° C for fan) |
| Warranty period, years | 12 |
| Estimated retail price, rub. | 18 000 |
The table with electrical parameters, located on the bottom of the power supply, reports that out of 750 W of total output power, 744 W can be directed at a voltage of 12 V. The permissible total load on the 3,3 and 5 V lines is 100 W, which with a large reserve enough for any modern system. Standby power allows a load of up to 3 A.
The unit is guaranteed to operate continuously at 100% output power at an ambient temperature of 0 to 40Β°C and at 80% power from 40 to 50Β°C.
All of the above parameters completely coincide with the indicators of the 750-watt "Focuses" already familiar to us. Of the differences - the level of certification 80 PLUS Titanium and a two-year longer manufacturer's warranty (12 years versus 10).
Separately, we dwell on the features of voltage stabilization, declared for blocks of the PRIME series. The only mention on the box is a regulation accuracy of 0,5% thanks to MTLR (Micro Tolerance Load Regulation) technology. However, upon closer examination of the documentation, it becomes clear that this only applies to voltage deviations with load changes, while the βbaseβ level of deviations can be up to Β±1% of the nominal value for 3,3 and 5 V lines and up to +2% for voltage 12 V (which, however, is also an excellent indicator).
Cables
The cable system is quite up to date with both the range of available connectors (which many higher power models will envy) and the length of the wires.
Power connector set:
- 1 Γ 20+4 contacts;
- 2 Γ ATX12V (4+4 pins) - CPU power;
- 4 Γ 6+2 pins - additional power supply for PCIe cards;
- 10 x SATA;
- 5 Γ Molex;
- Molex to 2 Γ SATA adapter.
It should be noted that, unlike the models of the FOCUS series, PRIME's cables with PCI-E power connectors are made exclusively single - without options with two connectors on one cable.
Like the updated models of the FOCUS series, on the updated units of the PRIME series, the main power cable is made in a nylon braid, and all others have a flat design.
All wires are typical 18 AWG.
Construction, internal arrangement
The internal components are cooled by a 13525mm HongHua HA12H135F-Z fan based on a fluid dynamic bearing. The rated fan speed is 2300 rpm.
Note that the early Seasonic PRIME Titanium power supplies that I had to deal with used a slower fan modification HA13525M12F-Z (1800 rpm).
The internal structure demonstrates the familiar layout of the Seasonic PRIME platform (among the models we reviewed, a power supply is based on a modified "platinum" version of this platform ).
Accordingly, we have a modern platform based on LLC resonant topology with individual voltage stabilization and active power factor correction.
The DC/DC converter board is located between the modular jack panel and the cooling controller daughter board. Also visible in the photo are smoothing solid capacitors on the board with modular connectors.
Another daughter board with an SRC/LLC+SR Champion Micro CM6901 controller chip is located behind the cooling control board.
The Weltrend WT7527V supervisor chip is located on the daughter board along the side of the case.
The input filter on the main PCB includes a fairly typical set of two common mode chokes, a CX capacitor, four CY capacitors, and a varistor.
There are also filter elements under the screen at the input of the power cord: there are a pair of capacitors CX and CY, as well as a fuse.
At the input, two electrolytic capacitors manufactured by the Japanese company Rubycon with a total capacity of 1030 uF are used. An empirically excellent result is the input capacitance in microfarads, numerically equal to the output power in watts - and this level is noticeably surpassed in PRIME TX.
At the output, electrolytic capacitors manufactured by Rubycon and Nichicon are used, as well as solid capacitors hidden under the cooling radiator.
In general, as expected, there is not the slightest claim either to the components used or to the build quality.
Testing technique
The testing methodology adopted by 3DNews is described in , which is recommended reading to understand the operation of computer power supplies and their most important characteristics. Refer to it to find out why a particular component mentioned in the review is needed and how it works, and how to interpret the test results.
Test results
The efficiency measured during the Seasonic PRIME TX-750 test shows the expected high results.
In part, such high rates are due to the measurement error of a household wattmeter, which underestimates the power βout of the socketβ at medium and high loads.
Closer to real efficiency values ββwill be the results of the 80 PLUS certification report for the Seasonic SSR-750TR (at 10/20/50/100% power, an efficiency of 91,71/93,85/94,59/92,89% was recorded, respectively). These results were obtained on a 115 V mains supply, so the efficiency should be higher on a 230 V mains.
According to the schedule from the manufacturer, in the 230 V network, the unit acquires a very impressive bonus to efficiency: at full power, the efficiency is comparable to the peak in the 115 V network, and at the peak it exceeds 97%.
In comparison with the models of the FOCUS series, one can note a significantly higher starting speed of the cooling fan (over 800 rpm), which is compensated by maintaining it almost to full power. Under full load, the impeller speed only slightly exceeded the 900 rpm mark.
When the hybrid cooling mode was activated, the start of the fan was noted only after reaching 70% of the power. At this point and beyond, the impeller rotation speed was almost the same in both modes of operation of the cooling system. However, even here there was a small fly in the ointment: when the fan starts (both when the power supply is turned on, and when the fan is activated after inactivity in hybrid mode), it initially starts at full speed, and for a second or two it turns out to be quite audible.
Although during testing we did not notice frequent turning on / off of the fan in hybrid mode, just in case, we would stop at the operation of the cooling system with the fan constantly on - it is almost inaudible under any load.
The cross-load characteristics of the unit, although they demonstrate quite decent parameters that fit into the manufacturer's promises, they are still a little disappointing: on most loads, deviations for all voltages slightly exceed 1% of the nominal value - although confidently, with a good margin fit into 2% tolerance . Recall that the manufacturer promised no more than 1% for the 3 and 5 V lines, as well as no more than 2% for the 12 V voltage - plus 0,5% when the load changes on each of the lines. In these parameters, including voltage fluctuations of no more than 0,5% when the load changes, the unit met.
However, the example of the ASUS ROG Thor 1200W Platinum, already mentioned above, with the ideal stability of all voltages, suggests that, most likely, we were just a little unlucky with the instance.
For a voltage of 12 V at a low frequency, the peak ripple range is about 20 mV (with an allowable 120 mV), and at a high frequency there are practically no ripples. For a voltage of 5 V, the ripple range is minimal at both low and high frequencies.
Conclusions
The Seasonic PRIME TX-750 power supply showed very good parameters: decent voltage stability, minimal ripple and excellent efficiency. Also, the model has a very rich delivery set and a record-breaking warranty period.
Of the shortcomings, only blots in the operation of the cooling system can be noted: a noisy start of the fan and a slightly overestimated (although not causing the slightest acoustic discomfort) speed when working at low and medium loads. And of course, far from the general availability of the price.
Source: 3dnews.ru