nvm slotMeaning, a solid-state drive that uses your computer’s PCIe slot, an M.2 connection form factor, and is managed by the NVMe protocol. In other words: A four-lane open hhway where yourThe ‘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.