Qnap Dual Sata SSD Expansion Card QM2-2S-220A, Storage controller, Form Factor M.2 2280/22110, Internal, Gold, Full-profile bracket, Low-profile bracket, Solid state drive. QM2 series PCIe cards add support for M.2 SSDs to a QNAP NAS, allowing users to configure SSD caching, a caching pool, or an auto-tiering volume to improve overall NAS performance.