With only a pair of scissors, a tiny screwdriver and this guide from Hardware Secrets you can mod any fan into a 3 speed fan.  It offers even the beginning modder a chance at a successful project, but it will lower the noise in your system from all of those high speed fans.  Even better, since all you are doing is undervolting the fan, you aren’t likely to find a way to hurt anything in your system.

“Did you know that you can modify any fan located inside your PC – CPU fan, VGA fan, north bridge fan, case fan, etc – to run at three different speed levels (low, medium and high) without spending any money at all? This is possible by just changing the configuration of the wires used by the fan. In this tutorial we will give you detailed instructions on how to do that, reducing the noise produced by your PC. ”

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