I have a little 85 watt pelt on my T-bird 800 and it works great. I didnt want a bigger one because I didn't want the temp to be that low because of condensation. My chip runs right at 17c full load with my case temp at 30c (it's gettin hot here in CA) and thats just about right, not too high but not below the dew point so condensation is not a worry. It's just about perfect. One thing though, pelts give off a lot of heat, the total load on my radiator is 85watts (peltier) + 50.7 watts my CPU is generating = 135.7 watts of heat that needs to go somewhere and the way my setup is, fresh air coming into the case throught the radiator. So all that heat is going right into my case. You need good exhaust out of your case to get rid of all that heat. When I get my full tower I'm gonna put the radiator so that it exhausts out the back.