First, I bought a Papst 412/2 40x40 fan, 10,0 m³/h, 18 dB @ 6000rpm nominal speed.
At 6000rpm, it blows a *lot* of air and is much less annoying than the stock 3cm fan,
but it is still the loudest fan in the system (at least when the CPU fan is running at its
usual speed of much less than...