Looking for some definitive info from US residents on a USB 3.0 card (out of US purchasing is highly difficult when looking for a card as it seems.) I have the 2009 Mac Pro 4,1 with 2 superdrives installed. Never use more than one, so OK with disconnecting one if necessary. (Please provide any install info you have) Will be using External Hard Drives and a USB 3.0 Card Reader. First post, thanks all!