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