I had a quick look around at overclockers (UK) for some quieter fans to replace those on my Xserve's PSU. There is one fan at each end of it. I haven't measured them yet but they look like 40mm fans. They are however, double the depth of a standard 40mm GPU fan, though there is only one blade. The other 'half' has moulded blades which do not move.
These things are seriously noisy. Anyone who has ever heard a G4 Xserve running close up will know the noise I mean and these two little fans are almost entirely responsible for it. I want some quieter ones.
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