UNITEK Uspeed PCI-E to USB 3.1 2 Port Express Card and 4 Pin Male Power Connector, USB3.1 XHCI Host Controller Adapter, Support Dual SuperSpeed + 10Gbps USB 3.1 PCI-E Express Card with 2 USB 3.1 Ports, one Step Update your Windows Computer to USB3.1. Support USB hot plug, low energy consumption Ultra High-speed USB 3.1 supports transfer rates of up to 10 Gbps, backwards compatible with USB3.0, USB 2.0 and 1.1 devices. Note: the actual transmission speed is limited by the setting of the device connected Easily and quickly install, enjoy copying videos, music, photos, and data files between PC and USB devices at blazing Dual Super Speeds 4pin connector strengthens the power to support performance. Support independent port power control and over-current detection Operating System Compatibility: Windows 7 / 8 / 8.1 / 10. (Driver included). This card does not fit into the PCI-E 1 slot.