I have a weird CPU fan issue - as long as I'm playing a game (Cities: Skylines), the CPU fan keeps spinning at the usual RPM while the CPU temperature starts increasing. As expected, the CPU overheats and the PC shuts down.
The weird part is that as soon as I quit the game, the fan kicks in and goes from ~3000 RPM to 5000+ RPM, trying to cooldown the CPU. I saw it in Open Hardware Monitor, but the change is also audible.
I'm looking for a way to either fix this behavior (BIOS update didn't help) or at least find a way to force the CPU fan to work at max speed.
I spend a couple of hours searching/trying anything I could think of, but besides physically removing fan control pins or finding out how to use RWEverything to circumvent the fan speed, I'm out of ideas.
OS: Windows 8.1
Motherboard: ASRock M3A785GMH/128M
Edit: BIOS settings didn't help - there is only target CPU temp/fan speed option and it doesn't change anything, even if disabled
Edit2: https://i.stack.imgur.com/TfgnQ.jpg Immediately after quitting - CPU temp goes down, fan RPM ramps up