Inateck 2-Port PCI-E USB 3.0 Express Card, Mini PCI-E USB 3.0 Hub Controller Adapter with Internal USB 3.0 20-PIN Connector - Expand Another Two USB 3.0 Ports - No Additional Power Connection Needed No additional power supply for normal recognition and operation needed anymore, One Step Update your Windows Computer to USB3.0 Easily with PCI Express to USB3.0 Controller Adapter Card; 1 USB 3.0 20-pin Connector ( expand another two USB 3.0 ports ) Super Speed USB 3.0 supports transfer rates of up to 5 Gbps - The actual transmission speed is limited by the setting of the device connected. Operating System Compatibility: Mac OS 10.8.2 to Mac OS 10.9.5 - The Expansion card is applicable to the MAC Pro (Early 2008 to 2012 Late Version); Windows XP, Vista, Windows 7, Window 8 and Windows 10 (32/64-bit), This PCI-E Card is incompatible with Mac OS X 10.10 Yosemite or Above; Backwards Compatible with USB 2.0 and 1.1 devices With quick and easy installation, this USB 3.0 PCI express I/O Card; Windows XP and Vista Users Please Note: Due to OS limitations, the real transfer speed after installation of the respective drivers will be located between the level of USB 2.0 and 3.0 Package: 1x USB3.0 PCI-E expansion card,1x driver CD, 1x low-profile PCI slot bracket, 1x mounting screw, 1x user manual