Features: 1.Applicability: For 2.5in U.2 NVMe SSD?SFF?8639 PCIe Adapter, improve system speed and performance. 2.Note: Before using the dual disk riser card, please make sure that your motherboard supports PCIe splitting, and make sure it has been split. In order to read the two hard drives normally. 3.Conversion: The PCIE interface of the computer motherboard can be converted into four U.2 SFF?8639 drive interfaces. 4.Drive Free: You can install the fixing screws directly after inserting the interface, no drive and no data cable. 5.Expansion: Dual U.2 SFF?8639 interface to PCIE 3.0 X16 SFF?8639 desktop drive expansion card. specification:Item Type: Riser Card Material: PCB Support Slot: PCI-E X16 Support: All 2.5in NVMe SSD Support System: For Windows for OS for Linux Etc. Parameters: PCI Express 3.0 x4 Channel Host Adapter Connects Your 2.5in NVMe SSD (U.2 / SFF-8639 Interface) to Your Desktop, Server or Workstation Through the MB PCIe x4 Slot for Easy and Fast Data Transfer; Install the U.2 2.5in PCIe-NVMe SSD Directly on the PCI Epress Add on Card for Use with the Motherboard PCIe x16 Bus Slot; Increase System Speed and Performance by Adding PCIe NVMe U.2 SSD to Your PC. PackageList: 1 x Riser Card 1 x Screw Pack