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After this week's launch of the new AMD Ryzen 3000 series processors, reports have again begun to make known that the PCIe 4 will be available on some existing 300 and 400 series cards. This comes despite AMD's official statement, the month last, that they would not allow the functionality of old cards, because the stricter PCIe 4 signal integrity standards would have led, at best, to a highly fragmented market where some cards work, others do not, and some advice can be downright marginal. At that time, the company had announced that the feature would be removed from the AGESA, which enters the latest Ryzen 3000 launch BIOS for older cards.
So to get to the bottom of it, I contacted the AMD representative tonight to find out what was going on with PCIe 4 support. The shortened version is no, AMD's plans have not changed: PCIe 4 support will be disabled in AGESA shipping for these cards.
Our plan is unchanged. For the reasons of reliability and consistency evoked by Computex, we always plan to disable PCIe Gen 4 for pre-X570 motherboards. AGESA will soon be available for motherboard manufacturers.
As it stands, all cards currently supporting this feature would use preliminary AGESAs, and as we have seen with our own BIOS issues, the Ryzen 3000 BIOS situation is still evolving rapidly. So with AMD intending to disable this feature permanently – and prevent any workaround – AMD's goals have not changed. At best, the few cards with beta BIOS with this feature will lose them in the future, unless users choose to stick to an unsupported BIOS (and certainly definitely buggy).
In the future, the appropriate support for PCIe 4 will continue to require an AMD 500 series card specifically designed to meet the signal integrity requirements for the higher speed standard. At present, this includes AMD X570 chipset-based cards; and although the company has not announced any other chipsets of the 500 series, we expect to see more later.
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