PCIe 4.0 wont be supported on B450, X470 and older chipsets
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Solved by porina,
QuotePre-X570 boards will not support PCIe Gen 4. There's no guarantee that older motherboards can reliably run the more stringent signaling requirements of Gen4, and we simply cannot have a mix of "yes, no, maybe" in the market for all the older motherboards. The potential for confusion is too high. When final BIOSes are released for 3rd Gen Ryzen (AGESA 1000+), Gen4 will not be an option anymore. We wish we could've enabled this backwards, but the risk is too great.
Robert Hallock, Ryzen product manager
via https://www.anandtech.com/show/14477/amd-confirms-pcie-4-not-coming-to-older-motherboards
PCIe 4.0 now NOT coming to older motherboards.
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