I overclock my GPU when i play games in windows. When I play games like Oblivion or say, Counter Strike Source, my iMac gets very hot, it will get to around 110° at the back vent. Does anyone have any ideas of how to cool the imac without voiding the warranty? I do not plan on opening it up or reapplying the thermal grease, so perhaps an external solution? I was thinking of just mounting 2 fans on the back vent to get the air moving; does anyone else have any other ideas?