HighPoint RocketU 1144E PCI-Express 2.0 x4 USB 3.0 Host Controller External Connectors: 2 x USB3.0 + 2 x eSATA Transfer Rate: Up to 6Gb/s Dimensions: 4.72 L x 4.53 H x 0.75 W Operating Systems Supported: Supports Windows Server 2012, Windows 8, 7 Supports Mac OS X 10.8.3 and later Linux OS support with xHCI driver of Kernel v2.6.31 or later Package Contents: RocketU 1144E Host Controller Software CD Quick Installation Guide