PCIe X16 to Oculink 4-port expansion card, motherboard must support PCIE X4X4X4X4 split. Support SFF-8611&8612 to SFF-8639 U.2 SSD. Support external SFF-8611&8612 Oculink devices. Uplink PCle Gen4 X16 total bandwidth 256Gbps Downlink PCle Gen4 X4 64Gbps*4Port Interface: TO OCulink SFF-8612 Support PCle: Support PCle4.0, backward compatible with PCle3.0&PCle2.0 System: for os/for /for Linux Colour:black Material:PCB+Metal The actual product may have slight color difference or difference, which not affect the use Package Contents: 1 * PCIe X16 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.