x4 PCI Express® Gen2 interface to deliver 2GB/s bandwidth 8x USB 3.0 ports by 4x independent NEC/Renesas PD720202 Host Controllers On-board 5VDC regulated power supply User-configurable 900mA and 1500mA current limit Software-programmable per-port power on/off control Supports cable-lock mechanism for reliable cable connection Supports Windows XP/7/8 and Linux Compliant with USB 3.0 specification Rev. 1.0 and Intel® xHCI specification Rev. 1.0