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The PEXUSB3S4V 4-Port PCI Express SuperSpeed USB 3.0 Card (with SATA Power) adds 4 external USB 3.0 ports to any PCI Express-enabled computer system. SuperSpeed USB 3.0 provides up to 5 Gbps of data bandwidth, while still being backward compatible with existing USB 2.0 devices at 480Mbps. Using a “stacked” port layout that places the ports one on top of the other, more ports are able to fit into a smaller space. This allows for all four USB 3.0 ports to be external facing, while still allowing the 4 port USB 3.0 card to fit into a small form factor/low profile computer system. With a built-in SATA power connector, each USB port can provide up to 900mA of power to USB 3.0 devices (500mA for USB 2.0) by connecting to your computer power supply. This USB 3.0 PCIe card is backed by a StarTech.com 2-year warranty and free lifetime technical support.