ASRock 2-Port USB 3.0 PCI Express x1 Card 10X faster transfer speed Speed upto 5 Gb/s Upgrade Flexibility Chipset: NEC PD720200; Interface: PCI Express 2.0 x1 Connector: 2x USB 3.0 ports; Support OS: Microsoft Windows 7/7 64-bit/Vista/Vista 64-bit/XP/XP 64-bit