How to determine from command line if NVMe slot is gen 3 or gen 4?

Cannot find PCIe NVMe SSD during Windows 11 installation can i use gen 4 nvme in gen 3 slot Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale slot using PCIe bifurcation: Set this up from Linux when BIOS does can you put a pcie x4 in a x16 slot slot that the drive can go in The B550 motherboard Is a half-length PCI Express x8 Gen 3 card compatible with a PCIe x4 Gen3 slot?

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