I have experienced a much louder fannoise from the ATI HD2600 after i upgraded my 2008 Mac pro to SL. I use the HD2600 as a second card beside a 8800GT just to drive my HDTV, but even when HDTV is switched off the fan is spinning fast. This makes my Mac Pro noisy. I contacted Applecare and they agreed to send me a brand new ATI HD2600. Recieved the card yesterday, and installed it. But this NEW card is giving me the same noisy fan sound. So i think there's got to be someting wrong with the combination SL and ATI HD2600XT. Are there others who experience more fan noise from the ATI card in a 2008 Mac Pro after they installed SL?