Rosewill RC-229U4 PCI-Express 2.0 to USB 3.0 Controller Card External Connectors: 4 x USB 3.0 Interface: PCI-Express 2.0 Transfer Rate: Up to 5Gb/s per port Operating Systems Supported: Windows 8, 7, Vista, XP and Linux Supports up to 4 external USB3.0 Devices Hot plug and Hot Swap Support Standard 4-pin Molex 8981 power connector or 15pin SATA power connector