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 due to the variable conditions applied by the device.
All the following performance descriptions are based on the products included in the respective graphs.
20 dBA Noise Output
- Low speed
- Low airflow
- High static pressure
- High power consumption
25 dBA Noise Output
- Low speed
- Low enough airflow
- High static pressure
- High power consumption
30 dBA Noise Output
- Low speed
- Low airflow
- High static pressure
- Mid power consumption
35 dBA Noise Output
- Low to mid speed
- Low airflow
- High static pressure
- Mid power consumption
40 dBA Noise Output
- Low speed
- Low airflow
- High static pressure
- High power consumption
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And again, the Alphacool Core 4000RPM 120mm is not only 3 times cheaper than the Noctua NF-A12x25 G2 but also better as a radiator fan.