Lookatool New 4-Port USB 3.0 to PCI-E Card Express Expansion Card Adapter VIA Chipset 5Gbps Easy plug & play installation. Automatically select IEQ & I/O address. Single-lane (x1) PCI Express throughput rates up to 5Gbps. Low-speed (1.5Mbps) / Full-speed (12Mbps) / High-speed(480Mbps) / Super-speed (5Gbps). Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devices. Fully compliant with PCI Express Base Specification Revision 2.0, compliant with Universal Serial Bus 3.0 specification Revision 1.0. Supports 4 downstream ports for all speeds. Built-in 4-pin power connector for receiving extra power supply from system. Support Microsoft Windows 95 98 2000 ME, XP, NT 4.0, VISTA, MAC, Win 7, Win8. Supports all USB data transfer function: control, add-on, interruption, synchrotrans. Working Frequency: 24 MHz.. Weight: Approx 40g.