Features: 1. Equipped with VIA main control chip to ensure high-speed and stable USB3.0 transmission. 2. USB3.0 5Gbps high-speed bandwidth, backward compatible with USB2.0, faster and more stable transmission. 3. Each interface is equipped with independent stabilized solid capacitors to ensure stable power supply. 4. Equipped with an external power interface to reduce the motherboard power pressure, stable and reliable operation. 5. The adapter card has strong compatibility, supports the system for Windows 7/8/10/Linux, etc. Specifications: Item Type: Adapter Card Product Model: KC005A Bus Interface: PCI-EX1 (compatible with X4X8X16) Power Interface: 12V Host Power Supply Expansion Interface: 4 x USB3.0 Transmission Rate: 5Gbps Support system: for WindowsXP (driver required) WIN7/8/10/Linux How to use: Open the case, insert the riser card, plug and play. Size: approx. 114mm/4.5in 22mm/0.9in 121mm/4.8in Package List: 1 x Adapter Card 1 x User Manual 2 x Screws