HardwareHell has posted part 1 of their PC Silencing Guide

Graphics cards, processors and almost every other component inside our PCs become increasingly powerful with each generation, and, as a result, often consume more power and produce more heat than the previous generation. Do we just have to accept that in order to cool these hot running components, PCs will continue to just get louder and louder? Not necessarily.

PC Silencing Guide - Part 1