This goes for everyone, but especially us who have our processors at 100% most of the time. Recently I decided to check my temperatures and got a small shock. With boinc at 100% the cores were reaching 68°C It had been some time since I last checked load temperatures since the last time I did they were comfortably in the highish 50's range. And it had been even longer since I replaced thermal paste. Perhaps a year and a half... or even two! It was when I replaced the E4300 with the E8400... So I took out the cooler, cleaned, put a dab of AS5 and... voila' - not bad for a 3Ghz processor overclocked to 4Ghz, on air. Also, AS5 has a curing time of ~200 hours so after that my temps should go down by another degree or two after curing time is over.