I'm currently running an 8core 3,1 with a 5870 1gb gfx card. I run bootcamp for games and am wondering if I simply buy a regular 980 or equivalent for this whether I can use one of the upper PCI slots. Will there be enough power? How will win7 recognize I want to use one card over the other etc? I'm mostly just interested in the upgrade for some newer games and am fine without flashing it and creating potential problems on the OSX side which I use regularly as well.