Two types of SSDs: SATA and NVMe

Two types of SSDs: SATA and NVMe nvme slot types 2 connector, more than one type of interface that can be used with M The Intel SSD is keyed for slots B and M, so it fits in the right slot nvme pcie slot In particular SATA SSDs are usually B+M key, so you can use them in any slot that supports SATA There are also NVMe SSDs with B+M key, but

nvme pcie slot 2 SSDs are keyed at both M and B positions, so they can fit in SATA slots and PCIe , even if they might not work in the latter NVMe SSDs are keyed only

nvme m2 slot 2 connector, more than one type of interface that can be used with M The Intel SSD is keyed for slots B and M, so it fits in the right slot  If you have the option of multiple slots where at least one supports PCIe, it's worth considering your secondary slot for an SSD upgrade When combined with