The PEXUSB3S23 2-Port PCI Express USB 3.0 Card lets you add two USB 3.0 ports to any PCI Expressenabled computer system. The USB card requires SATA power for functionality and delivers 900mA of power per port to USB 3.0 bus-powered devices (500mA for USB 2.0) via your computers SATA power connector. The PCIe USB 3.0 adapter is compliant with USB 3.0 standards for data transfer speeds up to 5 Gbps, while still offering backward compatibility with existing USB 2.0 / 1.1 devices. For added versatility, the controller card is equipped with a standard profile bracket and includes a low-profile/half-height bracket for installation in small form-factor computers. Backed by a StarTech 2-year warranty and free lifetime technical support.• Provides two external USB 3.0 connections • Supports data rates up to 5 Gbps • SATA power connector (required) provides up to 900mA per USB port • Compliant with PCI Express 2.0 specifications • Fully compliant with USB 3.0 rev 1.0 and Intel XHCI rev 1.0 specifications • Backward compatible with USB 2.0 and USB 1.0/1.1 devices • Includes a Low Profile/half-height installation bracket Advantage • Increase efficiency of your USB 3.0 devices with up to 5 Gbps of bandwidth • Fits into full or low profile/small form factor (SFF) systems, with a dual profile design Applications • Upgrade an older PCIe-based system with USB 3.0 connectivity to fully utilize USB 3.0 devices • Expand the USB capabilities of your system with two additional external ports • Connect additional external hard drives, CD/DVD drives, MP3 players, printers, scanners, webcams, game controllers, digital cameras, etc. to a computer system