By the end of this year or early next year, AMD will introduce Ryzen 4000 desktop processors that will use the Zen 3 architecture combined with an advanced 7nm process technology. Their belonging to the Socket AM4 platform was not disputed before, and now there is information about the compatibility of future new products with motherboards based on the AMD B450 chipset.
This information was shared on the pages gaming laptop manufacturer XMG, which managed to create a portable computer of the appropriate form factor, suitable for operating desktop processors of the Ryzen 3000 series with a TDP level of no more than 65 watts. Series system can even house a 16-core Ryzen 9 3950X if its TDP is configured appropriately.
The laptop manufacturer claims that motherboards based on the AMD B450 chipset will support future Ryzen 4000 (Vermeer) processors through a BIOS update. This is mentioned repeatedly on the Reddit page describing the properties of the XMG APEX 15 laptop. Along the way, XMG explains that Socket AM4000 Ryzen 4 processors will not be presented before October, and may be delayed due to the spread of the coronavirus. In addition to the TDP limitations for laptop use, you will probably have to put up with the lack of PCI Express 4.0 support at the motherboard level. The processors themselves support this interface, but AMD decided not to "tempt fate" in the case of the 400 series logic sets, and officially does not provide support for the new interface to these motherboards.
Source: 3dnews.ru