If you compare the absolute values with those of the reference, the Scythe fan cuts a good figure. It is a bit louder, but also manages significantly more throughput. At lower speeds, the result evens out again in places and even becomes less, i.e. quieter, at the end. For this very purpose, we have added a very elaborate measurement in 5-cfm steps at the end, which puts the sound pressure level as a curve over the entire speed band in relation to the volume flow.
Sound comparison (recording) at 100% speed
As just mentioned, the subjective feeling is a slightly more distinct noise from the motor and the rotor blades, which is of course also due to the slightly higher speed. The reference fan produces slightly less motor noise, whereas the MSI fan others can be described as loud. On the contrary, because the acoustic impression at the measuring microphone is also somewhat deceptive here.
Scythe Kaze Flex 120 ARGB
Noctua NF-A12 PWM
As a cautionary example of what’s really loud at around 1800rpm, I’d still have a cheap case fan from a PC table labelled on a rather high priced Taiwanese case supplier that could easily have been used to run octocopters through:
Sound comparison (recording) at 1000 rpm
The sound carpet is subjectively almost the same, you can really leave it like that
Scythe Kaze Flex 120 ARGB
Noctua NF-A12 PWM
Total speed range (300 to 1800 rpm)
Before I will explain the frequency analysis of the recorded spectrum to you, there is already the dreaded “station search”, where we will play through the fan operation from the lowest to the highest speed. And please don’t be alarmed, we’ve amplified the whole thing a bit so you can hear it better. So don’t set your listening level too high, though – it’s not particularly extreme this time. The Arctic P14 was a completely different calibre…
If the speakers have survived the whole thing up to this point, let’s now go into more detail.
Frequency spectrum in the housing
Let’s look at the frequency analyses of all measurements and all three speeds tested. The graphs speak for themselves, as you can also see a small lower frequency peak of the engine at full speed quite clearly:
![](https://www.igorslab.de/wp-content/uploads/2021/10/500-RPM-980x556.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/10/1000RPM-980x560.jpg)
![](https://www.igorslab.de/wp-content/uploads/2021/10/MAX-RPM-980x560.jpg)
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