PCIE4.0 X8 to OCulink,2-port expansion card,The motherboard needs to support PCIE X4X4 split. Support SFF-8611&8612,Convert SFF-8639 U.2 SSD. Support external SFF-8611&,8612 OCulink Device. Upstream PCIe Gen4x8,Bandwidth 128Gbps,Downstream PCIe Gen4x4 x2Port,Bandwidth 32Gbpsx2Port. Product size: 120x98MM Connector:TO OCulink SFF-8612 Support: Support PCle4.0, backward compatible with PCIe3.0 & PCIe Cle2.0 2.0 System:for os / for / for Linux The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:PCB Package Contents: 1 * Adapter 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.