IO Crest 4 Port USB 3.0 Pcie 2.0 X4 Controller Card Components Other (SI-PEX20148) PCI-Express x4 interface provide transfer rate up to 16GB/s, which give the ability for all 4 port to be used at full speed all at once. Fully compliant with PCI Express base Specification Revision 2.0 Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devices Compliant with Intel's extensible host controller interface Specification Revision 1.0 Must connect 4Pin Molex power feed to support max occupation of USB 3.0 Ports. Supports up to 4 downstream ports for all speeds Single-lane(4x) PCI Express up to 5Gb/s Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devi