Oodelay UB-131 USB 3.0 SuperSpeed 2-Port Low Profile PCIe 2.0 Host Card for Mac Pro / Windows USB 3.0 2-Port PCI Express 2.0 x1 Lane Host Adapter Provides 5V/1A to each port for bus powered devices Two USB 3.0 Type A downstream connectors on board (backwards compatible) Supports UASP (USB Attach SCSI Protocol) and Debugport function OS built-in in-box driver natively supported in Mac 10.8.4, 10.8.5, 10.9, 10.10, 10.11, Windows 8, Linux kernel 2.6.31 or later