2 Types of SSDs: SATA and NVMe

M2 SSD sata m 2 slot 2 M key slots have five pins and support SATA, PCIe, and NVMe protocols They are typically used for high-speed SSDs and other high-performance peripherals sata 3 slot SATA: This option uses the AHCI driver and routes to a SATA port via the connector It is slow, but widely compatible AHCI: Advanced Host Controller

sata slot 2 standard contains variants with up to four PCIe lanes, one SATA 6 Gbs and or one USB port So it is possible to connect PCIe as well as SATA SSDs