4-Port USB 3.0 PCI Express Expansion Card PCI-E Controller Card

GeneralQuantity1 setMaterialSilicon + Metal Dimensions & Weight Dimensions 4.65 in x 2.76 in x 0.71 in (11.8 cm x 7 cm x 1.8 cm) Weight 2.36 oz (67 g) Feature:100% brand new and high quality Super fast and high-capacity transfer solution, stable and reliable Fully compatible with PCI Express Base Specification Revision 2.0 Supports simultaneous operation of multiple USB 3.0, USB 2.0, and USB 1.1 devices Supports 4 downstream ports for all speeds Built-in 4-pin power connector for receiving extra power supply from the system Supports Windows 7 (32-bit/64-bit), Windows Vista (32-bit/64-bit), Windows XP Note:Light shooting and differnent displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is 1-3 cm.