Before the launch of the 3rd Generation Ryzen processors and X570 motherboards, AMD suggested older AM4 motherboards can receive a BIOS update to enable support for PCIe 4.0. Now, AMD has apparently cut the support for 400 and 300 series AM4 motherboards, which is later confirmed on a thread at Reddit.
Ryzen 3000 series processors will have up to 40 PCIe 4.0 lanes, if paired with a X570 motherboard. Previously, AMD and motherboard manufacturers had worked on making the top PCIe x16 slot and M.2 slot to support PCIe 4.0 for older AM4 motherboards. GIGABYTE has already released the new F40 BIOS to enable the features on their X470 and B450 motherboards.
However, the specifications on AMD’s website show only X570 chipset will have official support for PCIe 4.0. It also clearly states that the PCIe 4.0 functionality will not be backward compatible with old chipsets.
The comment in the r/AMD Reddit thread confirms the findings, saying that AMD cannot guarantee older motherboards to meet the signalling requirements of the PCIe 4.0 standard.
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