I've posted a few times on my ATI card woes, and now I have a curiousity. I bought a refurb MP at the end of September and it works awesome. My only problem was the standard ATI card would 'moo' with the fans speeding up and down constantly. The sound drove me nuts. Applecare sent me a new ATI card to replace it and it's silent - I love it. However, now Call of Duty doesn't play nearly as smooth. Is it possible the previous owner of my refurb overclocked the ATI card and that's what caused the moo'ing? I've since adjusted my game settings but I find it odd that two (supposedly) identical cards would have such a noticeable difference in game play on the same game with nothing else having changed on the system.