I've been playing Batman: Arkham City, Dirt 2, F1 2012 and many other games for hours and hours at a time. Using a GTX 670 card but I don't seem to hear the fan spin up. I am running on Mountain Lion with a non EFI card. I hope that playing games in OS X is not causing the card to boil up to 90c or higher, enough to cause damage. In Windows, the card used to spin up to maximum RPM after just a few minutes of gaming. Is there something going on with OS X? How can I check the temperatures of my GTX 670 non-EFI in OS X? I tried Zeus but it only shows the temp for my GT 120.