I have a Mac Pro 2006 model and also two Hackintoshes. Trying to install Winoze 7 on a 2006 Mac Pro is an utter pain in the back side so I have installed it on both my Hacks so they can dual boot into Windoze for playing games. The truth is though that I really do not like any non Unix-like operating system and just can't be bothered with Windoze. Due to more games being available for Windoze did have an adverse effect on the amount of time I played games until I discovered WineSkin. If you don't have it already get it. It's the best implementation of wine that I have found for OSX and it is so user friendly. I use it to play Assasins Creed, Guild Wars, Dawn of War ( all of them ), Tomb Raider and many others all on OSX. Best of all you can exit them instantly using Apple & Q. This is handy when I'm supposed to be working and my wife comes in to check on me. I work from a studio in my house as a CGI Artist and gaming is better than spacing out ( although I do some of that too ).