POWERADD USB 3.0 PCI-E Express Card 2 USB 3.0 Ports with 5V 4-Pin Power Connector and 19-Pin Front Panel Connector for Desktops [VL805 Chipset] Supports data transfer rates up to 5Gbps (500MB/s), fully compliant with USB 3.0 specification. 2 USB 3.0 downstream ports completely backward compatible with USB 2.0 and USB 1.1 devices. Built-in 19-pin connector makes more USB 3.0 ports extend to the front panel possible. Built-in 4-pin power connector for receiving power supply from system, 1 SATA to 4-pin power cable provided. Quick and easy installation, speed up your desktop PC immediately, enjoy your extra large files copying. Support Windows Vista/7/8 (32/64 bit) and more.