[Beowulf] 96 cores in silent and small enclosure

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Sun Apr 11 17:13:40 PDT 2010




* There are two fans in the system, noctua NF-P14 FLX

www.noctua.at/main.php?show=productview&products_id=33&lng=en&set=1

according to the specifications their acoustical noise is 19.6 dB. Are
there some simple guidelines of how the noise "adds up", i.e. what would
be the sound level of two fans, or three?

There's no real way to figure it out.  Sure, in theory, twice the noise power means 3dB increase, but fan noise is a funny thing. Some of the noise might be just from air rushing through your equipment.  There's also the difference between "blade noise" which is tied to the rotation rate (and harmonics), general mechanical noise, which is broadband, and not so "noticeable".

 The "rating" is in a special test jig, and not real representative of what a  particular fan will do in your particular installation.  All it really tells you is that a fan rated at 19dB is noticeably quieter than a fan rated at 29dB, and a whole lot quieter than a fan rated at 40dB.

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