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

nvme in pcie slot
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Everything is working fine So my question: If i will buy two and plug it into mobo with nvme drives

There are some NVMe drives that are designed to fit into a standard PCIe motherboard slot much like a graphics card, but most NVMe drives use

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nvme slot types cards with a B Key interface can only fit into a B Key host slot, and likewise for M Key But cards with a B+M Key design can fit in either