If you have the cooler with the copper heatpipes and the really small fan, here is a pro tip for you.
There is nothing wrong with the cooler, its just the fan that is very noisy.
You need a bigger fan.
I removed the AMD fan, got an old fan from an intel stock cooler, and glued it to the plastic surrounding the AMD cooler so it sits just above where the original fan lived. You could probably do the same with any 100mm fan.
I am running my Phenom II overclocked at 3.6Ghz with no problems, and it is a lot quieter than the original fan.