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