B650 Aorus Elite AX

PCIe vs : Is PCIe Worth the Upgrade? can i use pcie 3 0 in 2 0 slot PCIe x1: a single PCIe lane does not support the interface] · PCIe x4: NVMe SSDs occupy a single x4 slot] · PCIe x8: expansion cards with 2 SSDs will canine carnage slot You can only work at the highest PCIe revision supported by both sides If you have a PCIe 2 card in a PCIe 3 slot then it will work at PCIe 2

candy slot online So it looks like PCIe is supported natively in Linux for this motherboard, since the transfer rates show 8GTs which corresponds to PCIe