Features: 1.20GBPS: The 4 port USB 3.0 PCIe card features four dedicated USB 3.0 lanes and up to 5 Gbps of bandwidth per lane, for a total of up to 20 Gbps of bandwidth to increase the efficiency of USB 3.0 devices. 2.ENHANCED UASP SUPPORT: USB 3.0 pcie cards with UASP support let you experience faster speeds when used with UASP enabled enclosures, and UASP technology optimizes transfers by allowing multiple commands to be processed simultaneously. 3.POWER: The USB PCI Express expansion card by the large 4PIN power supply SAT A15PIN power connector can optionally provide supplemental power to the USB ports (if the motherboard is running low on power), providing up to 4.5W (5V 0.9A) per USB A port (without power cord). 4.COMPATIBILITY: The USB PCIe adapter card for desktop PCs is installed in a standard configuration PCI e x4 slot and supports for Windows, for Linux, for OS X, automatic driver installation on for Windows 8 and higher, for USB 3.0/2.0 devices. 5.MULTIPURPOSE USB CONNECTOR: Connect this USB adapter card via the internal PCI Express slot to connect additional external hard drives, VR headsets, game controllers, digital devices, and more to your computer. specification:Item Type: 4 Port USB 3.0 PCIe Card Material: PCB Interface Type: PCIE X4 (X8, X16 are Applicable, Not Applicable to PCI Slot) Applicable Models: Conventional Desktop (Small Chassis Need to Replace the Small Gear Piece ) Number of Interfaces: 4 USB3.0, Large 4PIN Power SATA15PIN Interface Support System: For Windows xp, for Vista, for win7, for win8, for win10, for Linux, for OS X and Other Mainstream Systems Transfer Rate: Total Bandwidth 20Gbps PackageList: 1 x Expansion Card 1 x Baffle