4 Port USB 3.0 PCI-E Expansion Card PCI Express PCIe USB 3.0 HUB Adapter 4-Port USB3.0 Controller USB 3 0 PCI e PCIe Express 1X(B)

Item Description Question: what is the difference between Model A and Model B?
Answer: The power supply mode is different: Model A is powered by 4Pin Molex. Model B is powered by independent power supply module, which is more convenient without external power supply required. FAST USB 3.0 PCI-E PCIE 4 PORTS Express Expansion Card Adapter. 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 Approx.
Size: 11.8 cm x 7cm x 1.8 cm / 4.6" x 2.8" x 0.7" Free drive for win 8/10. if win 7, XP ect., please contact me for the drive.
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. What's Include 1 x PCI Express Card Product pictures