I heard a weird click sound from the PC. This sound occur occasionally after I over clocked my single core CPU to 3.32GHz from 3.2GHz.
Could it be the fan slow down / speed up depending on temperature?
More aboutweird click sound clock
If your sure it's coming from the cpu the fan is the only this it could be, it's the only thing with moving parts.
You probably want to find out exactly where its coming from. Someone in one of my threads suggested that you get a card board tube maybe one from a papertowel roll and put it up to your ear and pinpoint where the sound is coming from.
Didn't use this method but I had the same problem. Not sure if it was before or after I OCed but I noticed it within the last few weeks. Didnt bother me until now and it turned out to be a case fan. I replaced the case fan and no more annoying clicking noises.