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TEST RESULTS
Stock Fan Testing
The included stock fan is a clear plastic 120mm fan with a 4-pin PWM connector.
The blade design is similar to Panaflo and Yate Loon fans — the trailing edges
are more or less straight, and pass by the struts at an angle (which is better for reduced tonal noise).
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Stock fan.
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A sticker on the hub identifies Silentmatic as the manufacturer.
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| Brand |
Silentmatic
Co. Ltd. |
Power Rating |
0.22A |
| Model Number |
SFA1225MU-12P
|
Airflow Rating |
59.48 CFM |
| Bearing Type |
Sleeve |
RPM Rating |
1,100 ~ 1,800 rpm (± 10%) |
| Hub Size |
1.58" |
Noise Rating |
Min. 19.5 ~ Max. 31.4 dBA (± 10%) |
| Frame Size |
120 x 120 x 25 mm |
Header Type |
4-pin PWM |
| Weight |
120g |
Start Voltage |
4.5V |
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TEST MEASUREMENTS
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Voltage
|
Noise
|
RPM
|
|
12V
|
36 dBA@1m
|
1860 RPM
|
|
9V
|
25 dBA@1m
800Hz tonal peak
|
1140 RPM
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8V
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18 dBA@1m
|
750 RPM
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7V
|
17 dBA@1m
|
540 RPM
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Fan @ 12V: Very buzzy with lots of chatter, mainly due to vibration.
The chatter lessens if held firmly in free air or properly secured on a heatsink
as opposed to standing unsupported on a hard or soft surface. At 36 dBA, it
is loud and annoying.
Fan @ 9V: Much smoother, with only a slight whine detectable.
The SPL registered at 25 dBA with a tonal peak at 800Hz.
Fan @ 8V: The noise level was reduced to a gentle hum. It's quiet and unobtrusive.
Fan @ 7V: The fan is effectively silent. It sounded very
smooth with some clicking evident at close range.
Overall, it behaves more or less typically for a sleeve bearing PWM fan. Its
acoustics are lousy at full speed, but when undervolted, it quiets down nicely.
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