X-MEDIA XM-UB3204 4-Port SuperSpeed USB3.0 PCI Express Card for Desktop PC<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> 4 USB3 downstream ports for desktop </span></li><li><span class="a-list-item"> Backward compatible with USB2./1.X </span></li><li><span class="a-list-item"> Support windows XP/vista/7/8.X/1 </span></li><li><span class="a-list-item"> USB3 specification compliant， backward compatible with USB2 &amp; USB1.1 4 external USB3. ports， 1x faster than USB2 supports PCI-express rev. 1.a </span></li><li><span class="a-list-item"> USB3.0 Specification compliant， backward compatible with USB2.0 &amp; USB1.1 4 external USB3.0 ports， 10x faster than USB2.0 Supports PCI-Express Rev. 1.0a </span></li><li><span class="a-list-item"> USB3.0 data transfer rate up to 5Gbps 5V 4 pin connector to power USB devices from your PC power supply Plug and play installation Supports PC Windows XP/Vista/7/8 </span></li><li><span class="a-list-item"> Package Include 1 USB 3.0 express card (with 4-pin power connector) 1 CD Driver </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41oz5l2-2dL.jpg" noproxy>