Startech PEXUSB3S2EI 4 Port Pcie Usb 3.0 Card This PCI Express USB 3.0 card offers a cost-effective upgrade that lets you add four USB 3.0 ports to your computer through a PCIe slot. It offers two external ports plus two internal USB 3.0 headers to help adapt your desktop or server to support a variety of USB 3.0 devices. Features Flexibility to connect external and internal USB 3.0 devices and supports UASP Fast, hassle-free setup with Windows 8 native support, and fits into standard or low-profile systems Backward compatibility lets you save money and connect existing USB 2.0 and 1.x devices Transfer large files at lightning speed, with throughput support up to 5 Gbps Optional SATA power connector provides up to 900mA per port for high-power USB devices PCIe x1 interface, compliant with PCI Express 2.0 specifications Configured with full-profile bracket, half-height bracket included Bus Type - PCI Express Card Type - Standard Profile (LP bracket incl.) Interface - USB 3.0 Port Style - Integrated on Card Ports - 4 Maximum Cable Length- 9.8 ft. Maximum Data Transfer Rate - 5 Gbps MTBF - 1, 920, 042 Hours Type and Rate - USB 3.0 - 5 Gbit/s UASP Support Connector Type - 1 - PCI Express x1 Male External Ports - 2 - USB 3.0 A (9 pin; SuperSpeed) Female Internal Ports - 1 - SATA Power (15 pin) Plug 2 - IDC (20 pin; USB 3.0; Motherboard Header) Receptacle OS Compatibility - Windows8 / 8.1 (32/64bit), 7 (32/64), Vista (32/64), XP (32/64) , Windows Server2012, 2008 R2 , Linux 2.6.31 and up (Tested up to 3.5) System and Cable Requirements - PCI Express enabled computer with an PCI Express x1 slot or higher (x4, x8, x16), SATA power connector (recommended, but optional) Dimension - 4.7 H x 3.6 L x 0.7 W in. Weight - 1.9 oz.