Well, beyond using frictionless bearings and, oh, I don't know, a magical orb of silence, probably not.
Anyway, has anyone found a fanless PSU that's actually good? Cause all of the reviews I'm seen of what's around seem to be crap.
Also, do the fanless ones top out at 350 watts? Even though I know it's probably ridiculous, I think building a silent overclocked gaming rig using a zalman reserator silent water cooler would be so cool.