The four-level design supports hard drives of various lengths.Suitable for M.2 NVMe protocol solid-state drives Utilizing PCIe 3.1 x8 motherboard direct connection, the physical interface guarantees a theoretical speed of 256Gbps (NVMe). Further enhance hard drive performance to allow computer users in fields such as design and video production to fully utilize their computer's capabilities. Driverless and plug-and-play for multiple mainstream operating systems Dedicated to 4-drive NVMe-RAID! Aluminum alloy CNC machining + hard oxide reinforced heat dissipation, mecha grille design, efficiently dissipating heat, combining hardcore aesthetics with powerful performance Product name:PCIe 3.1 8X to 4M.2 (M-Key) NVMe hard drive expansion card Use chip:ASMedia/ASM2824 Type and rate:PCI-Express 3.1 (8 Gbps) Drive type:M.2 (PCIe, M-Key, NGFF) Drive connector:4- M.2 (PCIe, M-Key, NVMe, NGFF) Transmission rate:8Gbps interface:PCI Express x8 Working temperature:5°C to 50°C (41°F to 122°F) Supported devices:M.2 interface SSDs, serial cards, network cards, SATA expansion cards, and other devices. use:Servers, workstations, audio-visual equipment, NAS, gaming equipment, etc. Features:Extensive installation compatibility, supporting almost all M.2 NGFF drives (2280/2260/2242/2230). The board has four M.2 NGFF type M key sockets. Color: As Shown Material: PCB Package Contents: 1*PCIe 3.1 8X to 4M.2 (M-Key) NVMe hard drive expansion card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.