I still have a Pentium III 1Ghz socket 370. I just put some Arctic Silver 5 on it with a dual fan heatsink. The heatsink has a small aluminum foil glue to it. I took that off but not sure if I was supposed to. Temperature now at idle after bootup in room temperature, 70-75 degree, is around 55-56. Restart after continous use shows CPU temp at around 60 degree. I don't know if that's normal for a P3 1Ghz socket 370 or not. If anyone still own a P3, please let me know your CPU temp at idle and after regular use.