Zerotherm Zen FZ120 CPU Cooler

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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).

Stock fan.

A sticker on the hub identifies Silentmatic as the manufacturer.

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

1860 RPM
25 [email protected]
800Hz tonal peak
1140 RPM
750 RPM
540 RPM

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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