smcFanControl (Score 1)

Be prepared to install and run a 3rd party app called smcFanControl if you do anything graphically demanding with a mac, in particular the imac. Games have a tendency to overheat them, which drastically shortens there lifespan. Apple is of course in complete denial about the 'problem' but you know recommending users to ramp up there cooling fans while playing games would go against there quiet, sleek, hip imac marketing campaign. *sigh*