I'd had my early 08 MP for a few months now and finally decided to install Vista on it to give it some experimental running as well as maybe get into gaming more. I've been fiddling around for about 10 minutes now when I realized how much quieter it seems to be. It's because my ATI isn't 'mooing' the fan faster and slower. I've wondered if I had a defective card but now I don't know anymore. I'm pretty sure my OS X driver is current so... how do I make the mooing go away in OS X? This thing is amazingly quiet right now! I love it! I know noisy ATI cards seem to be an issue here, but if the card isn't defective, what do I do?