Feature:1. 4 USB 3.0 Ports: The PCIE to USB expansion card easily adds 4 USB 3.0 ports to a PCIE enabled desktop using a PCI Express to USB3.0 controller adapter2. High Speed: The USB PCI express card adopts for VIA805 main control chip, which reaches USB 3.0 maximum 5Gbps transmission speed, and 4 USB 3.0 ports can work at the same time. Backward compatible with USB2.0. 5 Gbps is shared by 4 downstream ports3. Stable and Fast: 4 conductive capacitors ensure more stable power supply for each interface, and can save files between USB devices and computers at a faster speed, etc4. Comprehensive Protection: Each interface has independent insurance with overcurrent and short circuit protection. Each interface has an independent 2A power supply, 4 interfaces work independently, a total of 8A. No additional power cord required5. Wide Compatible: The USB PCI express card supports for Win 11, for Win 10, for Win 8, for Win 7, for Win Vista, for Win XP (32 or 64 bit), for linux and other operating systems, backward compatible with USB 2.0 or 1x device, compliant with the above PCI Express x1 slot and versionSpecification:Item Type: PCIE to USB Expansion CardProduct Material: PCBChip: For VIA805 Main Control ChipBus Interface: PCI E X1 (compatible with X4 X8 X16 graphics card interface)Expansion Interface: 4 x USB3.0Transmission Speed: 5GbpsFeatures: No External Power Supply, Four Independent Large Inductors, More Stable Power Supply, Support for External USB Device Hot Swap, Support for Win, for Linux and Other Operating Systems.Package List:1 x PCIE to USB Expansion Card1 x Screw