Case fan making whirling sound, cycles speed up then down

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thisusernameisnowtaken

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Sep 9, 2010
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One of my fans sounds like it is working overtime. Narrowed down to cpu or top system fan just can't tell which (Hyper tx3 cooler sits about an inch away). Originally though was cpu so gave that a clean and dropped temp from ~50c to around 40c as it was building up dust. Running CPUID HWMonitor shows two of my fans jumping from around 2-3k rpm maxing out around 600-700k rpm. Also run EasyTune6 as its a gb mb. Tweaked the fan speed in there so doesn't run 100% til it hits 50c. Its HW Monitor function shows cpu temp a few degrees lower and I also noticed the system fan drops to 0 rpm every now and then even though I can still see the fan spinning. No idea if fan could be causing this (pretty sure its dying as its avg rpm is around 500 when its meant be about 1500) or some sort or psu or mb controller issue. Any advice is appreciated.
 
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Brantyn Gerik

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Sep 18, 2013
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It's a fan problem. either try a silencing adapter on it, or use a different fan. you will easily be able to tell which fan it is if you actually look inside the case, perhaps feel around (a gentle touching of your finger to the center of the fan will not harm you or the fan, but will slow the fan enough to drop the noise, letting you know if it was that specific fan or not
 
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1brogers

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Jan 15, 2009
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I have a SuperMicro X8DAH+-F motherboard in a SuperMicro 747TG-R1400B-SQ case with hot swappable cooling fans controlled by SuperMicro's Supero Doctor III system monitoring software.

From time to time my fans race (one fan in particular) without any apparent rise in heat or other reason.

Traced it to a poor connection on the hot swappable fan which (apparently) runs at full speed if the "fan speed control" lead on the fan wiring is not present or intermittent.
 
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