Just insert the RC-508 into the PCI-E slot of your motherboard, and own USB 3.0 ports immediately. PCI Express (PCI-E) is a standard interface on most types of motherboards. With PCI-E, RC-508 provides high-speed data transferring between PC and USB 3.0 devices, up to 5 Gbps; thus, you may directly enjoy high-resolution videos stored in your USB 3.0 storage, other than copying them to your PC in advance. RC-508 offers 4 ports of USB 3.0, and each supports backwards compatibility to USB 2.0 and 1.1 automatically, making it easy to copy files and enjoy videos simultaneously.
Specifications   Type: PCI Express to USB Card
   External USB Ports: 4 port USB 3.0
   Internal USB Ports: USB 3.0
   External Ports: 4 port USB 3.0
   Data Transfer Rate: Up to 5.0 Gbps
   Operating Systems Supported: Windows XP/Vista/7/8/8.1 (32/64 bit)
Features
   Chipset: Renesas uPD720201
   Supports 4 downstream ports for all speeds
   Supports the following speed data rates as follows:
   Low-speed (1.5Mb/s) / Full-speed (12Mb/s) / High-speed (480Mb/s) / Super-speed (5Gb/s)
   Single-lane (x1) PCI Express throughput rates up to 5 Gb/s
   Support USB Battery Charging Specification Revision 1.2
   Fully compliant with PCI Express Base Specification Revision 2.0
   Compliant with Universal Serial Bus 3.0 specification Revision 1.0
   Supports simultaneous operation of multiple USB 3.0, USB 2.0 and USB 1.1 devices
   Compliant with Intel's eXtensible Host Controller Interface (xHCI) Specification Revision 1.0
   Built-in 4-pin power connector for receiving extra power supply from system
   Hot-swapping feature allows you to connect/disconnect devices without powering down the system
