The INQ guide to silencing a PC
 

WHAT DOES IT take to make a modern PC quiet? To find out, I attempted to build a very quiet, high-performance PC using components from various manufacturers. I set myself a challenge by basing the system on an extremely hot 3.4 Ghz Pentium 4, and by trying to keep things as simple as possible - so no watercooling.

http://www.theinquirer.net/?article=21875

Read [M] Building a Silent Air Cooled System -
http://www.madshrimps.be/?action=getarticle&articID=286