OS X runs fine on my new 27 inch Quad Core i7 iMac, a machine that is made specifically by Apple to run their OS. Also runs XP Pro 64 bit quite well.
Ooooh... ya got one of those, eh? Here’s a silly question — do you like it? I’d get one, because the price for the component quad core will probably be more money, and require the outboard hardware (monitor, maybe other stuff), and be set for another fifteen years, but A) I don’t think it will last like this one has and B) if anything fails on an all-in-one (in five years or whatever) the whole thing has to go in. I was in the Big Box store for a few minutes tonight, and took another look at the regular 27”, $1699, and was again tempted. :’)