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

pcie 4 nvme in pcie 3 slot   Dan pciex16 slot configuration

If the PCIe slot can not be Bifurcation or BIOS is not set to x4x4x4 x4, only one hard drive can be recognized If the motherboard can only be set to x8 x4 x4

You can have one, four, eight or sixteen lanes in a single PCIe slot, denoted as x1, x4, x8, or x16 PCIe technology enables interface Well, while it might have some of the standard features of a regular Gen 4 NVMe drive, what with its four lanes of PCIe connectivity and the

slot voor koffer PCIe Size and Lanes · PCIe x1: a single PCIe lane does not support the interface] · PCIe x4: NVMe SSDs occupy a single x4 slot] · PCIe x8: expansion cards Due to the forward and backward compatibility, a PCIe GPU will perform like a PCIe GPU card if connected to a PCIe (or in the future