If you have an older Mac that's been upgraded with a G3 or G4 card, Ryan Rempel has created a package that will enable the backside cache, giving a notable speed increase to these systems.
He's also provided a highly detailed instruction page, which I would strongly encourage you to read and understand before proceeding!
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20001206095820556