Comparing the absolute values with those of the reference, the Arctic P12 makes a really good figure! The subjective sensation is also a quiet, not humming noise, where the tear-off noise dominates. This is surprising in that the Arctic P12 PWM only has a rigid frame without any decoupling. Due to the slightly lower speeds, it is even quieter as a case fan than the Noctua fan, chapeau! On the radiators, the picture then evens out again and both perform about the same.
Frequency spectrum of the Arctic P12 PWM as case fan
Let’s next look at the frequency analyses of all measurements for all fans measured and all three speeds tested in the process. The graphs speak for themselves:
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