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Discussion in 'Overclocking & Cooling' started by ng4ever, Jan 12, 2019 at 10:46 AM.
What would cause a CPU fan to stop working or spinning sometimes only?
Broken wire. Poor connection. Fan issue. Port issue.
So, I would try a different spot on the main board, one of the numerous fan connector locations. Just make sure you plug something into the cpu fan connector as well, like a random system fan, so the system doesn't think the fan isn't plugged in.
If it’s a cpu fan and you have speedstep enabled or some other bios option, sometimes at idle a fan can stop
if its a pwm fan a bios setting may be jacked up.
Lots of reasons.
Usually - it's a speed control setting that's dropping too low for the motor to pick up - motors usually have a low speed % threshold that they can't run underneath, or they stall or do things like what you are seeing. Try adjusting the minimum fan speed up if possible, or disable the auto-speed control and run it manual speed.
It may also be your energy savings settings kicking in - jmilcher is correct, if temp is low enough some systems will shut off fans entirely.
Or it's a failing motor/bearing and the fan needs to be replaced ASAP. That would also cause this.
Your system begging you to watercool it?
Depending on the cooler, it could have a 0rpm function at low temps. I had an Arctic cooler on an FM2+ APU some time ago that would stay at fan off until temps got to about 42c, then it would start spinning. A BIOS fan profile change could make it spin up, but it worked well how it was setup.
As was stated though, it could be settings, a bad wire, or just a bad fan if you're not used to it shutting off completely.