No additional power supply for normal recognition and operation needed anymore, optimized board plane architecture, fast and easy installation, keeps your for Mac Pro case tidy - With quick and easy installation, this PCI Express card expands your for Mac Pro by four high-speed USB3.0 interfaces, offers a simple solution for connecting to USB 3.0 devices from your for Mac Pro Extend with 3 USB 3.0, 1 Type C, Type A downstream ports for standard desktop PC Compliant with USB 3.0 specification. Compatible with USB 2.0 & 1.1 specification. Date transfer rates up to 5.0Gbps - 10x faster than USB2.0; Plug & play and hot swapping capability. Bus-powered mode and no external power required for most of peripherals. Support UASP: 70% Faster than traditional USB 3.0 with UASP. The UASP Transfer Protocol only can accelerate read and write speed of SSD hard disk. Supported Operating Systems: Compatible with for Windows XP/ Vista/ 7/ 8/ 10. Windows 10 and for Mac 10.8.2 and more latest systems are built with a driver inherently. Windows systems earlier than Windows 10 and for Mac OS earlier than Mac 10.8.2 require installing a driver in CD Power Usage Alerts: For stable operation, do not connect it to more than two high power-consuming devices, such as 1 TB hard drive. For Mac OS users, the devices on the PCI-E card will disconnect if the computer goes into sleep. 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 be recognized, 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 for