Topro 4 Port USB 3.0 HUB to PCI Express Card Adapter VIA Internal Chipset Approx. Size: 11.8cm x 7cm x 1.8cm / 4.6" x 2.8" x 0.7" Supports Windows 7 (32-bit/64-bit), Windows Vista (32-bit/64-bit), Windows XP Built-in 4-pin power connector for receiving extra power supply from the system Fully compatible with PCI Express Base Specification Revision 2.0 Package included: 1 x PCI-E Express Card,1 x CD Driver