2-Port USB 3.0 PCI Card... SuperSpeed data transfer rate up to 5Gbps - 10 times faster than USB 2.0; Compliant with USB 3.0 specification Revision 1.0; Backwards compatible with USB 2.0 and USB 1.1; Supports all USB compliant data transfer type: Control / Bulk / Interrupt / Isochronous transfer; Compliant with ExpressCard Standard Release 1.0; Supports Bus power (100mA max/port) or 900mA max / port with external power adapter.