Hello,
just bought and received a new Nitro N50-640 desktop PC.
Problem: After the PC runs for a couple minutes, the CPU fan starts pulsing - going up to somewhat high RPM, then down to basically idle again. This cycle repeats about every 3 seconds, which creates a very annoying sound. This does not seem to be related to dangerously high temperatures, it happens even at very low temperatures like 55°C.
The problem occurs no matter if the BIOS setting "SMART Fan" is enabled or disabled. There are no additional BIOS settings besides this one available.
Interestingly, when manually setting the fan speed to a specific percentage via the included NitroSense software, the problem persists - even when setting the fan speed to 100%, the ACTUAL fan speed still goes up and down significantly! The pulsing only stops when setting the fan control to "Max"; but that is extremely loud and obviously not a proper solution. Reinstalling NitroSense does not change anything.
I have found no other software (SpeedFan, Speed Control, ArgusMonitor etc.) that is able to even detect, let alone control the CPU fan.
After googling around, I have found other descriptions of this problem, but no solutions. Has anyone encountered the same issue and maybe has found a way around it? I would prefer to avoid complicated/costly things like completely replacing e.g. the motherboard to get around ACER-specific restrictions on fan control.
Thanks in advance for any help.
[Edited the thread to add model name to the title]
