IgorsLAB published Resizeable BAR - Ryzen R9 5900X vs. Ryzen 9 3900XT with AMD Radeon and NVIDIA GeForce in the benchmark A quote from the article:

Unofficially it went with the ComboAM4PI V2 1.2.0.1 already longer, but since 03.03.2021 AMD announced also officially the support of Zen2. Up to now, AMD required a current Zen3 CPU, a B550 or X570 motherboard and an updated BIOS. Or just a current Intel solution.

  Resizeable BAR - Ryzen R9 5900X vs. Ryzen 9 3900XT with AMD Radeon and NVIDIA GeForce in the benchmark