Startech PEXUSB3S42 4-Port Pci Express Usb 3.0 Card A cost-effective solution for adding USB 3.0 connectivity to your computer. This 4-port PCIe USB 3.0 card gives you three external ports and one internal port, for the ultimate connection flexibility. Features Expands your computer connectivity with four extra USB 3.0 ports (3 external, 1 internal) Easy to install with native OS support in Windows 8.1, 8, 7, and Linux kernel 2.6.31 or later Fits standard or small form-factor computers, low-profile bracket included Data transfer rates up to 5 Gbps plus UASP support Backward compatible with USB 2.0 and 1.x devices Built-in optional SATA power connector provides up to 900mA per USB port PCIe x1 interface, compliant with PCI Express 2.0 specifications 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 Type and Rate - USB 3.0 - 5 Gbit/s UASP Support Connector Type - 1 - PCI Express x1 Male External Ports 3 - USB 3.0 A (9 pin; SuperSpeed) Female Internal Ports 1 - SATA Power (15 pin) Plug, 1 - USB 3.0 A (9 pin; SuperSpeed) Female 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) Dimension - 4.7 H x 3.4 L x 0.7 W in. Weight - 2.1 oz.