Addonics 2-Port USB 3.0 PCI Controller Model AD2U3PCI Type: PCI to USB Card External USB Ports: 2x USB Ports Specifications: External dual Ports USB 3.0 Type A connectors Support PCI 33 / 66MHz Compliant with PCI Specification 3.0 Low Profile PCI Form Factor Compliant with Universal Serial Bus 3.0 Specification Revision 1.0 Compliant with Intel eXtensible Host Controller Interface (xHCI) Specification 0.95 Two USB ports that offer SuperSpeed (5Gbps), HighSpeed (480Mbps), FullSpeed (12Mbps), and LowSpeed (1.5Mbps) transaction 5V USB bus power automatically from PCI bus or PC power supply through Molex 4 Pin connector - 500 mA max. without connecting the 4 Pin Molex power connector on board. Chipset : NEC