Plain vanilla iMac 10 months out of the box with the nVidia card. It crashes all the time with the recommended settings. It occasionally ( once every day or two ) crashes with all the video settings to Low or Off. No overclocking, apple ventilation and power. The real bummer is that the game runs great and looks phenomenal with the video settings cranked way up. It doesn't drop a bunch of frames like I would expect if I was over taxing the system, it just up and dies. That is the screen shows strange artifacts (snowy), and is frozen. Sometimes the mouse/cursor will jump wildly when I move it while the screen/system is otherwise frozen, but usually it is nowhere to be seen. The only solution is to hold the power button for 10 seconds (and crank the settings down).
Did I over-mod or poorly configure my iMac?