Do you mean the cpu HSF is too loud or the case fans are too loud, er what?here's a suggestion..
I have my old celeron 300a@464 2.4v running as a linux server now, and it's damn loud with like 5 fans, so I'm planning on installing a switch on the front of the case that will allow me to turn all of the non-essential fans on and off at my whim. A router doesn't need to be overclocked to within an inch of it's life so i will only need 1 cpu fan on all of the time now.
Install a fan switch. Or if you want to get creative, install a thermostatically controlled fan switch! heheh
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aventari
"Maintainer's Motto: If we can't fix it, it ain't broke. "