I just upgraded my secondary box from a A64 2800 to an A64 3400, a 33% increase in clock speed (from 1.8 Ghz to 2.4 Ghz), the only thing I changed was that I used Arctic Silver 5 as the thermal grease instead of the stock heatsink pad. My full load temp dropped from 52C to 47C...after a 33% increase of clock speed...holy crap is that stuff good.
Damn that thing is not available in my city....usually it's only available in big cities...and online purchase is still untrusted here (malaysia),at least that's what most of people that i know would say.most of what u guys can purchase online/at stores are not available/or not at same price range
I had a problem in summer here with ambient temps around 39C.
My cpu is a firstname.lastname@example.org and was hitting close to 68C. I was like OMG!!!
I even open the side of the case and put a big fan blowing in it. I have an artic freezer 4 (cpu cooler) and I was very worried. So I went and bought an artic silver 5 and now that ambient temps are around 32ish my cpu doesn't go above 58C at full load!!!!! And yes after you have it about 200 hours it drops even more (a couple extra degrees!!) Now I can o/c without worrying about frying my pc to 3.4.
Don't apply it like most thermal paste. Other wise temps might actually get higher. Just takes a small amount. About the size of a bb. And don't spread it around. I've heard people get better results on Video cards by spreading it very thin. But for processors, follow recommended instructions.