[2023] GPU fan speed problem.

Right click on ck3.exe , properties, compatibility. Tick "disable fullScreen optimisations" untick every other box in that dialog, Apply and exit.
Then in the launcher Game Settings menu, select fullScreen display mode, Vsync off, cap refresh rate at 60.


If those don't help:
DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach here your Documents/Paradox Interactive/CK3/pdx_settings.txt .
From your Documents/Paradox Interactive/CK3/logs/ folder, attach here system.log , error.log , exceptions.log  

That settings file shows the cap at 144, not 60. I have seen some cases recently where nVidia only supports 144hz, is that what happens here? You set it to 60 but it changes to 144?

What actual fps do you get in the game?  

If you are getting overheating at 60hz there is a definitely a cooling issue here. What actual CPU and GPU temperatures are you seeing at that time?

If you see near or over 80c:
Clean out all air vents it has (compressed air cans are good for this). Make sure airflow to them is not blocked by anything like walls, books or whatever.
If that doesn't drop the temps enough, you probably have a faulty fan or a heatsink/thermal paste problem. You may need professional help at that point.

Good luck!  

Fan speed is not directly under the control of games or any app of course; if it runs faster than you think it should for a given temperature that must be a driver, Windows or hardware problem. Why only those two games I have no idea!

While those GPU and CPU temps are a little lower than the threshold to cause such issues (80c IME) they are up there and I think too high. Can you try the steps I mentioned last time?  

Yup, that will be it ! Well done.