According to leaked data from a Gigabyte hack, AMD's upcoming Raphael processors based on socket AM5 will only carry support for PCIe 4.0, and not the latest 5.0 standard that Intel will offer with Alder Lake.
AMD's Upcoming Socket AM5 for Raphael Processors to Lack PCIe 5.0 Support : Read more
AMD's Upcoming Socket AM5 for Raphael Processors to Lack PCIe 5.0 Support : Read more