In my experience, the best is to just swap out the fan. It is by far the easiest, cheapest, and best way.
Basicaly, unscrew the 4 screws, and the cheap fan comes off. Leave only the HS. Buy a 4cm fan. Attach it, and plug in where you pluged in the old fan. Done. I can't hear it at all, and the temerature went WAY down from what it was with the cheap fan.
Basicaly, since it runs at 4200 rpm, and is built MUCH better than the stock, it is silent. And it cools better because it is larger, and there is more airflow from taking out all the crap inside the HS.
I prefered this meathod because it cools better, is silent, adds only 1cm height to the original HS, I didn't have to take the MB out, cost me $7, and start to finish was 5 minites.
There you go Stoutpuppy.