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Comparison Noctua NF-A12x25 PWM chromax.black.swap vs Noctua NF-A12X25 PWM

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Noctua NF-A12x25 PWM chromax.black.swap
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Main specs
Featuresfor casefor case
Product typefanfan
Fan
Number of fans11
Fan size120 mm120 mm
Fan thickness25 mm25 mm
Bearing
magnetic centring /SSO2/
magnetic centring /SSO2/
Min. RPM450 rpm450 rpm
Max. RPM2000 rpm
2000 rpm /1700 L.N.A/
Speed controllerauto (PWM)auto (PWM)
Max. air flow60 CFM
60 CFM /49.7 L.N.A/
Static pressure2.34 mm H2O
2.34 mm H2O /1.65 L.N.A/
MTBF150 K hours
Noise level23 dB
22 dB /19 L.N.A/
Power source4-pin4-pin
General
Mount typeboltsbolts
Dimensions120x120x25 mm120x120x25 mm
Added to E-Catalogaugust 2022may 2019

MTBF

The total time that a cooling fan is guaranteed to run before it fails. Note that when this time is exhausted, the device will not necessarily break — many modern fans have a significant margin of safety and are able to work for some more period. At the same time, it is worth evaluating the overall durability of the cooling system according to this parameter.

Noise level

The standard noise level generated by the cooling system during operation. Usually, this paragraph indicates the maximum noise during normal operation, without overloads and other "extreme".

Note that the noise level is indicated in decibels, and this is a non-linear value. So it is easiest to evaluate the actual loudness using comparative tables. Here is a table for values found in modern cooling systems:

20 dB — barely audible sound (quiet whisper of a person at a distance of about 1 m, sound background in an open field outside the city in calm weather);
25 dB — very quiet (normal whisper at a distance of 1 m);
30 dB — quiet (wall clock). It is this noise that, according to sanitary standards, is the maximum allowable for constant sound sources at night (from 23.00 to 07.00). This means that if the computer is planned to sit at night, it is desirable that the volume of the cooling system does not exceed this value.
35 dB — conversation in an undertone, sound background in a quiet library;
40 dB — conversation, relatively quiet, but already in full voice. The maximum permissible noise level for residential premises in the daytime, from 7.00 to 23.00, according to sanitary standards. However, even the noisiest cooling systems usually do not reach this indicator, the maximum for such equipment is about 38 – 39 dB.
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