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 adapter 2. 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 ports 3. 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, etc 4. 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 required 5. 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 (32/64 bit), for linux and other operating systems, backward compatible with USB 2.0 / 1x device, compliant with the above PCI Express x1 slot and version Specification: Item Type: PCIE to USB Expansion Card Product Material: PCB Chip: For VIA805 Main Control Chip Bus Interface: PCI E X1 (compatible with X4 X8 X16 graphics card interface) Expansion Interface: 4 x USB3.0 Transmission Speed: 5Gbps Features: 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