Question Fluctuating RPM (Corsair AF140mm) - 3pin

Nov 14, 2020
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Hello, new joiner here, hoping someone can help.

I recently purchased a pair of Corsair AF140s (non-pwm) as intake fans mounted at the front, attached to my Mobo SYS_FAN header, using a typical Y-splitter. My motherboard's BIOS provides DC control for the fans, which I set to 7.2v (60%). I then noticed that the RPM readings for that fan, are constantly fluctuating from ~900rpm to ~1900rpm every few seconds. The RPM readings from my BIOS and the HWMonitor tell the same story. It doesn't seem to be spinning down and up as the RPM suggests based on my observation.

I know it's not a problem with my Mobo fan header or sensor, since I tried using other fans with it, and the readings are just fine. Is this normal, or a usual occurence? Or does it suggest a defective fan?

Specs:
Ryzen 5 3600
MSI B500M Bazooka
1660 Super
 

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