Maximum bandwidth speed is PCIE 5.0 X4 GEN5, backward compatible with PCIE 4.0, PCIE 3.0.; Only Compatible with M. 2-nvme protocol SSD, only support M. 2-Mkey interface.; M. 2-Mkey extension cable, support 2280, 22110 SSD extension, 128GBPS.; Double shielded cable, silver-plated high-speed cable, PCIE 5.0 transmission.; M. 2 gold finger using immersed gold process, support 2280 holes. Does not support hot-swap.