2 Types of SSDs: SATA and NVMe

Sonnet 2x4 Low-profile PCIe Card m 2 in pcie slot 2 slots support only PCIe SSDs Combo SSD slots support both interfaces so you can use either a SATA SSD or a PCIe SSD with them NVMe is m2 slot mainboard SSD into the expansion slot PCI-Express Gen4x4 supported NVMe SSD Storage space, 250 GB

m2 expansion slot PCI-SIG also authored standards for SSDs, which provides PCIe connectivity for small form factors and is designed for internally mounted expansion cards