ITEM NAME:USB 3.0 expansion card 2 ports USB 3.0 PCI-E PCI Express 19 pin 4 pin IDE c W1A3 USB 3.0 expansion card 2 ports USB 3.0 PCI-E PCI Express 19 pin 4 pin IDE c W1A3 It extends with two USB 3.0 downstream ports for standard desktop PCs and one USB 3.019 pin connector (which can extend another two USB 3.0 ports). ？Super Speed ??USB 3.0 is fully compatible with the original USB system, peripherals and cables. Compliant with the PCI Express 2.0 specification of one complete lane (X1). TWO has an external 5 Gbps super speed USB 3.0 port. One 19 pin internal 5 Gbps Super Speed USB 3.0 port. Better support power with built-in 4 pin IDE power connector for added power to hungry bus power device. Super Speed ??USB 3.0 provides 10 times performance improvement via Hi-Speed ??USB 2.0. USB 3.0 is compliant with the Intel Extensible Host Controller Interface (xHCI). Up to the maximum transfer rate of 5 Gbps. Super speed USB 3.0 is backward compatible with USB 1.0 / 1.1 / 2.0 devices (data transfer speed at 1.5 / 12/480 Mbps). Supports PCI low profile. Ideal connection for digital cameras, scanners, printers, external CD / DVD / Blu-ray writers, hard disk drives, flash memory drives etc. Hot swap fully compatible with plug and play. System requirements: PC with 512 Mbytes of RAM and 1.0 GHz or faster processor or faster processor. 1 Available PCI Express 1.x or 2.x slots. System support: Windows XP / Vista / Windows 7 (32/64 bit) / Windows 8 (32/64 bit). NOTE: To achieve maximum throughput, the PCI - Express slot must be version 2.0 or higher. If multiple ports are transferring data at the same time to the limited throughput of the PCI - Express slot, the performance may degrade per port. High quality USB 3.0 cables and equipment are required to meet the transfer rate of USB 3.0. It supports 32 bit & 64 bit OS. Make sure the power supply is connected properly. Otherwise, message error on the USB port "Hub port power surge" none 5 V bus power is displayed. Please be carefu
