[Sir Kenyth]

I toyed with this idea myself. Peltiers are effective, but risky. I would only use one if you are a serious overclocker and like to experiment and spend money. A thermal circuit using a relay which would trip off the power supply would be recommended along with a separate thermal triggered alarm. I don't think either would be too hard for someone who's familiar with a soldering iron and willing to look up some circuit schematics. Of course, PC component swapping has removed the need for basic electronic skills from techs. these days. Unless you have a personal interest, you wouldn't know anything beyond testing the output of the power supply. The only reason I know anything is due to HAM radio and that hobby has lost it's lustre to me these days.