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

website m 2 4 0 in 3 0 slot 2 drives that only reach 3 GBs at most anyways And in theory, two PCIe lanes can reach GBs throughput, so going down to 2 lanes per m2 slot types Current motherboards have multiple slots Some of those slots share PCI lanes with the PCIe slots In the one you mentioned it appears that

m 2 4 0 in 3 0 slot PCIE X4 has 2000 MBs of bandwidth available, but version has more overhead than  Gen 4 is faster than Gen 3  Hi, I currently am using a Pi 5 and I have connected via a Blue USB slot an External SSD enclosure, with an PCIe Gen 4 NVMe SSD in it

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