Colour Name:4USB3.0 for MAC Pro Due to frequently updated drivers, please download the latest version on our official website Inateck to enhance your using experience Features - No additional power supply for normal recognition and operation needed anymore, optimised board plane architecture, fast and easy installation, keeps your Mac Pro case tidy - PCI Express Expansion Card with 4 USB 3.0 Ports: With quick and easy installation, this PCI Express card expands your Mac Pro by four high-speed USB3.0 interfaces, offers a simple solution for connecting to USB 3.0 devices from your Mac Pro - Support UASP: 70% Faster than traditional USB 3.0, with UASP Transfer Protocol; The UASP Transfer Protocol only can accelerate read and write speed of SSD hard disk. Supported Operating Systems The Expansion card is applicable to the MAC Pro ( 2008 to 2012 Version) - Incompatible with Mac OS X 10.10 Yosemite or above Mac OS 10.8.2 - 10.9.5 & Windows 8 - No additional drivers are needed for Mac Pro/ Win8, it has built-in support for the FL1100 chipset Windows XP and Windows 7 (with included drivers) Power Usage Alerts -For stable operation, do not connect it to more than two high power-consuming devices, such as 1 TB hard drive. -This USB 3.0 express card is not meant to serve as a stand-alone charger. If the card doesn't work properly from the start, you may try out the following steps Step 1: de- and reattach the devices to bee recognised, so the system can try another recognition search. Step 2: Augment with the optional power supply, so an automatic search can be retried. Step 3: Check the PCI-E socket on the main board for possible faults. Step 4: Try out another Mac Pro, if available, to determine the card's general functionality.