Recently I am preparing my Mac Pro for newer games like Battlefield 3 and figured out I needed a new GPU, in this case, the GTX 590 because it has the MDP and I'm not concerned about the price. The problem with this is the GTX 590 needs a minimum of 700W to power itself, I would like to know some suggestions on how I can add more power to my Mac Pro? My Mac Pro runs on Windows 7 so I don't need to be able to run in OSX.