External Connectors: 2 x USB3.0 Internal Connectors: 1 x 20-pin USB 3.0 Transfer Rate: 20Gb/s Transfer Bandwidth Operating Systems Supported: Windows 7, Vista, 2008 Dimensions: 5.11" x 2.69" x 0.06" Features: Port: 2 x USB 3.0 Super Speed Speed Type-A ports (5Gb/s per port) 1 x 20-pin USB 3.0 Port (10Gb/s) Supports USB 3.0 SATA 6Gb/s / 3Gb/s HDD's and SSD's, enclosures, docks Backwards compatible with USB 2.0 / 1.1 Hot-Swap / Hot-Plug Compliant with xHCI (Extensible Host Controller Interface) Optimized for external USB drives and drive enclosures. Package Contents: RocketU 1142A USB 3.0 HBA CD (Driver software) Quick Installation Guide