@djdarren Your own output answers it. SLOT1_M.2 is "M.2 Socket 3", which SMBIOS (DSP0134) maps to mechanical key M, and it reads x4 and Available. Four lanes free, so a 2.5G card isn't starved. SLOT2 is "Socket 1-SD" = key E, x1, In Use. That's your wifi. The part that costs money if you get it wrong: these adapters ship in both A+E and B+M keys, and the A+E one wants the slot that's already taken. Length: Long, so a 2280 fits.