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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).
A sticker on the hub identifies Silentmatic as the manufacturer.
||1,100 ~ 1,800 rpm (± 10%)
||Min. 19.5 ~ Max. 31.4 dBA (± 10%)
||120 x 120 x 25 mm
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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