Posted on Monday, July 15 2019 @ 11:00 CEST by Thomas De Maesschalck
Despite ASUS'
efforts to enable PCI Express 4.0 on 400-series motherboards, AMD is still firm that this is a no-go. AMD previously said this feature would be stripped from the AGESA microcode that goes into the final Ryzen 3000 launch BIOS, and now the company
reiterated this to AnandTech.
So, to get right to the heart of matters, I reached out to AMD PR this evening to find out what’s going on with PCIe 4 support. The short version then is that no, AMD’s plans have not changed: PCIe 4 support will be disabled in the shipping AGESA for these boards.
Our plan is unchanged. For the reliability and consistency reasons cited at Computex, we still intend to disable PCIe Gen 4 for pre-X570 motherboards. That AGESA is being released to motherboard manufacturers soon.
The site suggests pre-X570 motherboards that do offer PCI Express 4.0 support, like the ASUS 400-series from the previous article, are using an unsupported pre-release AGESA microcode that may contain various bugs. AMD does not want PCI Express 4.0 for pre-X570 motherboards because it would make thing to complicated for consumers, with some SKUs supporting it and others not.
