I was thinking of getting a Mac Pro and installing windows on it via bootcamp so I could play games, and I was wondering if anyone knew if this card was compatible:

ATI 4870 X2

The other option is to get the 4x 256 MB ATI cards for a total of 1GB, which should be fine, since I can run Crysis on 1920x1200 near full settings with a 768 Nvidia 8800 GTX.

Also, do games run well on a bootcamp windows? Or is it better if I just keep my PC and use my mac for mac stuff only. I would though like to be able to sell my PC and then just have 1 computer, two really takes up space...