Compatible with PCI-e 4.0 motherboards and is backward compatible with PCIe 3.0 and PCIe 2.0, PCIe 1.0. Supports Windows/M-a-c/Linux OS. No driver required. Supports M.2 NVME protocol SSD. Compatible with 2280/2260/2242/2230 mm M.2 NVME SSD. M.2 NVME SSD to PCIe X1 adapter card for your computer that provides extremely fast read/write speeds, fast file access and transfers, and fast boot times. Up to 32Gbps The transmission mode is PCIe4.0x1/PCIe 4.0x4 is on and flashes when reading and writing. The M.2 NVME to PCIe x1 adapter only fits PCIe M.2 NVME based M key. Does not support B&M key. Supports PCI-e 4x 8x 16x interface. This PCIe to M.2 NVMe adapter converter card with 80mm / 120mm standard PCI holder and screw.