What does the X4 mean in an PCIe Gen X4 NVME drive?

nvme 4 0 in 3 0 slot   Dan nvme pcie 40 in 30 slot

NVMe SSDs via a single x16 PCIe slot adapter speeds, with backward compatibility for PCIe slots

The card physically has an X4 interface, so it could be plugged into an X4, X8, or X16 slot It can still physically only access 4 lanes (else Buy Kingwin Nvme SSD to PCIe Removable SSD Mobile Rack for PCIe Expansion Slot Tool-Less Installation and Triangle Key Lock online at low price

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