Anybody have a link for the less noisy fan replacements? For some reason I bid on a MDD 867 Mhz and won it (they only made 867 duals correct?).

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Well, if you don't get specific recommendations, I'd identify the type of fans in each position (2 X 60mm X 25mm in power supply, 120mm X 25mm opposite CPU, mumble X 25mm under optical drive?) and then look for well regarded quiet alternatives.

IIRC, this site has good reviews on fans: http://www.silentpcreview.com/articleindex

But don't get too compulsive (unless you enjoy that sort of thing) because the pursuit of the silent PC can drive a man mad....