Normalized Noise Tests
For these tests, I set the fan to speeds with noise output at the following predefined levels: 20/25/30/35/40/45 dBA. I skip the corresponding tests if the fan under the test cannot reach some noise levels. The speeds shown in the graph below are measured with the fan in a clear space inside my hemi-anechoic chamber without any obstacles. I set these speeds on the Longwin machine, but they slightly change because of the variable conditions that the device applies.
20 dBA Noise Output
- Low speed
- Low airflow
- Top static pressure
- Normal power consumption
25 dBA Noise Output
- Average speed
- Low airflow
- Top static pressure
- Increased power consumption
30 dBA Noise Output
- Average speed
- Low airflow
- Top static pressure
- Average power consumption
35 dBA Noise Output
- High speed
- Average airflow
- Top static pressure
- Low power consumption
40 dBA Noise Output
- High speed
- Average airflow
- Top static pressure
- High power consumption
45 dBA Noise Output
- High speed
- Average (to low) airflow
- Top static pressure
- High power consumption
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Is that secondary impeller noticeably adding harmonics, particularly that major 3rd? I’m actually curious if this thing has sound design characteristics I might want to experiment with.
please check the frequency analysis I conducted for that.
Hi @crmaris can you please tell me what size screws I would need to mount this fan on an AIO radiator?
It is 38mm thick so 45mm long I would say.
Besides the thickness, is there any reason the home enthusiast should not consider these the best watercooling radiator fans for low noise? Less optimal noise frequencies than its competitors?
The thickness is the major issue for most cases, with limited internal space.
That mechanical clicking in the low speed recording sounds like it could get *pretty* irritating.
As someone who tried using these (8K variant) fans for home PC cooling, I can confirm that clicking noise is VERY irritating already at ~1K RPM. I bought pack of 3, and each of them sounded like this – mounted, not mounted, held by hand, etc. Clicking becomes tolerable around 400-500 RPM, but listening closely they’re still pretty noisy compared to others, and at this point there’s no advantage in using these fans over anything that came pre-installed with case. Too bad, because overall they’re really cool and with such static pressure would be perfect for a crowded PC.