<OL style="
margin-top: 0px;"
><LI>Go to <a href="http://www.silentpcreview.com/"/>http://www.SilentPCReview.com/</a> often and ask questions on thier forums.</LI>
<LI>Cheap PSUs make a racket. Buy a quality PSU with temperature controlled fans.</LI>
<LI>Buy the right CPU and physically check the exact model/batch number before you hand over your cash. Some P4s (eg: the 2.0A with a Northwood core) produce very little heat and provide respectable performance, but others are really hot and need very loud fans to keep them cool. There is a comprehensive list of suitable CPUs at <a href="http://www.silentpcreview.com/"/>SilentPCReview/</a>.</LI>
<LI>The standard Intel heat-sink fan (HSF) is fairly quiet when undervolted and sufficient for a cool P4 running at less than full load in cooler climates. (see update below)</LI>
<LI>The case does make a difference - cheap cases will need suspension for the hard drive.</LI>
<LI>Only use low performance video cards that do not require a fan, or better still, use the on board video if you can bear it.</LI>
<LI>Get a motherboard which does not have an onboard fan.</LI>
<LI>Make sure your motherboard allows the heat sink fan speed to be controlled by software, otherwise you must always run the HSF fast enough to cool the CPU at full load.</LI>
<LI>A single platter Barracuda IV is almost inaudible apart from structural vibrations when it seeks. (see 5th point)</LI>
<LI>Read the articles below.</LI>
</OL>