[ios84dev]

I think he means rack mount home servers, those are pretty nuts because of the noise that most rack mount cases make. Figure in a 1U case you normally have at least 4 15K RPM fans going at all times, even if you put it into "quiet" mode its enough to hear from the next room normally.

[timc3]

My rack mount case is silent enough to record with a high quality condenser microphone in the same room. But it is 4U with 120mm slow fans.

Its all about how you build them. Obviously a 1U with 40mm fans running fast could make a lot of noise.