PCI-E to USB 3.0 Type C +3 Type A Expansion Card - Interface USB 3.0 4-Port Express Card Desktop Supports UASP with Low Profile Bracket for Windows MAC Pro Linux

No Power connection required,built-in power IC

Backwards compatible with USB 2.0 and 1.1 devices; Operating System Compatibility: Windows XP/Vista/7/8/10/MAC Pro 10.8.2 Above and Linux

Compatible with PCIE X1, X4,X8, X16 slot

Come with Low profile Bracket ,compatible with Slim PC

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 Mac Pro, if available, to determine the card's general functionality