What Big Lar is saying is the rating on the peltier must exceed the part it is trying to cool. Say a typical Athlon 1GHz runs at 50 watts +. If you overclock it, it can go up to 70 watts easy. So a 72 watt peltier probably wont cut it. If you get too big of a one, then you can create a whole different kinda mess, freezing and condensation. And I wouldn't suggest using a peltier without a water cooling setup, its really the only way to remove that kinda heat (Chips 70+ watts and the peltier's 85+ watts) or you will lock up from your mobo or your video card overheating cuz you system temp will get into the 40's.