SIIG DP 4-Port USB 3.0 PCIe i/e (JU-P40311-S1) Add four (3 external and 1 internal) Super Speed USB 3.0 ports to your PCIe-enabled desktop PC Works with high-bandwidth USB 3.0 devices, such as external hard disks, high resolution webcam, video surveillance cameras, digital video cameras, multi-channel audio and more Supports data rate up to 5Gb/s and backward compatible with USB 2.0/1.1 devices Dual profile design to work with full height and low profile chassis with included brackets Supports per port over-current protection