nvm slotThe ‘Key M’ or ‘M key’ slot is specifically for PCI-E SSDs aka NVME SSDs which are currently the fastest SSD type that one can buy. The ‘Key B’ slot is for M.2 SATA SSDs.Want to know how to Install an M.2 (NVMeSATA) SSD on your PC? With our help, you'll learn your M-key from your B-key, and what to do in