PCIE x16 to x8+x4+x4 splitter adapter card, front and back double sides M.2 NVME x2 designed. This product can run 2 NVMEs simultaneously, but only if the motherboard supports PCIE signal splitting. Supports PCIE 4.0, strong compatibility and downward with 3.0, stable operation. Product front and back .2 can to NVME 5 kinds specifications of SSD, PCIE X16 can to PCIE expansion card, adapter card. Front and back M.2 can to NVME expansion and M.2 NVME SFF-8639 card. Name: pcie x16 to x8+x4+x4 splitter adapter card : PH43 Input Port: PCIE X16, M.2 NVME x2 Speed: PCIE 4.0, downward with 3.0 Type:Add On Cards color:Black Material:PCB size:150 x 38mm Package Contents: 1 x PCIE4.0 Expansion Adapter 1 x screwdriver 2 x screws 2 x studs Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.