Tek Republic TR-PCIE-U34S00 PCI-E to USB 3.0 4 Port Express Card with low profile bracket SuperSpeed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected 4 USB 3.0 downstream ports for standard desktop PCs; Including low profile bracket Backwards compatible with USB 2.0 and 1.1 devices; Operating System Compatibility: Windows XP/Vista/7/8/10 With quick and easy installation. All USB 3.0 PCI-E Cards require an external connection to the power supply of the PC in order to supply voltage to the USB buss