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Most PCIE NVME SSDs use 4 lanes right now. So theoretically CPUs could support (total PCIE lanes / 4). It usually boils down to motherboard configuration or add-on card support for how many you can practically get in a system though.



The only m.2 with PCIe x4 is the 'M' key.

Everything else is max 2.


That's what NVMe SSDs use.




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