This dual-port M. 2 PCIe expansion card integrates NVMe high-speed and SATA mass storage expansion in one single adapter. The M-key slot delivers full PCIe 4.0 x4 speed for NVMe SSD for system boot and high-speed workloads, while the B-key slot connects SATA M. 2 drive via matched SATA 3.0 cable for bulk file storage.