USB 3.0 PCIe Gen2 Host for Mac, Winodws and Linux w/o external power required Supports PCIe 1.0 and PCIe 2.0 Slot, no external power needed Compliant with Universal Serial Bus 3.0 Specification Revision 1.0 Compliant with Intel eXtensible Host Controller Interface (xHCI) Specification 1.0 Two USB 3.0 Type A downstream connectors on board All USB ports can handle SuperSpeed (5 Gbps), HighSpeed (480 Mbps), FullSpeed (12 Mbps), and LowSpeed (1.5 Mbps) transaction