Ableconn PUSB31P2A USB 3.1 Gen 2 (10 Gbps) 2-Port Type-A PCI Express (PCIe) x4 Host Adapter Card - Support MacOS 10.12-10.14 and Windows 10/8 Two USB Type-A connectors. Up to 10Gbps data transfer speed, twice as fast as USB 3.0. Low Profile board. Include both Low Profile and Regular Size PCIe brackets. PCIe x4 card fits in any PCIe 2.0 or PCIe 3.0 x4 or x8 or x16 slot. Instead of taking 5V power directly from power supply, our design includes power switching regulator circuit that automatically converts 12V from PCIe bus or from 15-Pin SATA power to ensure sufficient 5V/2A bus power on each USB port. No driver installation is required on Mac OS X 10.9 to 10.10, and 10.12 to 10.14 (NOTE: does NOT work on OS X 10.11), Win10, 8.1, 8, and Server 2012. Driver download is available for 32/64 bit Windows 7/Vista, and Windows Server 2008/2003. Note: UASP featue is only available with Microsoft and OS X built-in drivers. Currently, the ASMedia driver does not have UASP feature. Built with ASMedia ASM1142. Fully RoHS compliant. Made in Taiwan.