I am looking at replacing my current M.2 drive with something faster. My system boots fine from this M.2 drive on the adapter card. Right now I am using an adapter because my old motherboard has no port for an M.2 NVME drive. Why are you using an adapter? Note that the PC's BIOS must support NVME in order to boot form such a drive.That is the part I don't understand, the adapter card I am looking at has all the contacts for an X16 slot so the M.2 X4 drive should be able to take advantage of that. It can still physically only access 4 lanes (else there'd be no point in having all those extra contacts in an X16 slot). The card physically has an X4 interface, so it could be plugged into an X4, X8, or X16 slot. I have no deep knowledge of the architecture, but I'm using an adapter card with an old (non-NVME) M.2 drive. I doubt that an M.2 drive in an adapter card could perform better when plugged into an X16 slot. The X4 is the number of PCI-E lanes used by the M.2 card.
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