Features: 1.PCIE X16 Expansion Card: Front and back double sided 2NVME design. The front and back M.2 can connect to SSD PCIE X6 of five NMEs, PCIE card, NVME SATA expansion card, and M.2 NVME SFF8639 card. 2.6 Port: With the PCIE BGA, a four port split card can be converted into a six port split card, providing excellent performance. 3.Strong Compatibility: The riser expansion card supports PCIE 4.0 and is compatible with PCIE 3.0, with strong compatibility. 4.Stable Operation: The expansion card adopts sophisticated production technology, stable operation, plug and play, easy to use. 5.Premium Materials: Made of PCB, it is strong, durable, not easy to damage, not easy to wear. specification:Item Type: PCIE X16 Expansion Card Material: PCB Input Ports: PCIE X16 M.2 NVMEx2 Speed: PCIE4.0, Downward Compatible with 3.0 PackageList:1 x PCIE X16 Expansion Card 1 x Screwdriver 2 x Screw 2 x Nut NoteThis product can run two NVME at the same time, but the mainboard must support PCIE signal splitting