Lets us look at an example of how m.2 slots are configured: These slots have less bandwidth as well as the fewest lanes. 32Gb.s PCIE 3.0 4x External Graphics Card Stand bracket I've changed to an empty m.2 card into the pcie x1 and using it as my 2nd drive at the moment. Pcie x1 slot m.2 . See the specs which say: If i buy an x1 carbon (5th gen) with the sata3 drive option, will i be able to upgrade it later to an m.2 pcie ssd, or does the sata option come with a crippled motherboard? I bought a nvme m.2 to pcie x1 adapter and inserted in the slot and the xps 8940 couldn't recognize it (boots windows from it). Ik nam de proef op de som met een intel 660p ssd; I've seen magic before with the m.2 slot not being installed and/or it supporting only msata mode. 1x m.2 slot (key m) support up to pcie 3.0 x4 and sata 6gb/s. I am using all 6. Normally, a pcie x1 slot is completely avoided if you don’t know the exact purpose as well as usage of a pcie x1 slot...