GamersHell has posted part 2 of their PC Silencing Guide

If you are considering getting into the addictive game that is silencing, you will be looking to either build a new system with silence in mind or silence an existing system. If you are doing the former, then you're in a much more envious position, as planning the right system from the start can be all that's needed to build a quiet computer. Those looking to silence an existing set-up face a more difficult task, but this part of the guide is accustomed to assist either audience.

PC Silencing Guide - Part 2