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if your mac pro has more than one processor (cores dont count) then you might want xp pro or vista so you can make use of both processors
 
Thanks - yes I have 2 x 2.8 processors. So would going with XP Pro (I don't fancy Vista) really benefit me for when playing games?
 
I wouldn't know from experience, but I think that it would. Using two processors is definitely better then one. Especially if you have a Mac Pro.
 
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