I have a 2009 MP with three Cinema monitors, two 24" flanking a 27". The two cards I have already are the ATI Radeon HD 5770 with two mini DP ports (the 27" and a 24") and the old GTX 120 (one mini DP port with the other 24"). I like to do some gaming on this machine and would ideally like a GTX 680 with just the center monitor, and the other two 24's on a different card. How could I pull this off? The Mac Pro only has a single power connector for the graphics card I believe. If I tee that can the power supply handle the load? Heat or noise issues?