EDIT: READ THE SOLUTION BELOW; THIS WAS IN FACT A CPU THERMAL PROBLEM, NOT A GPU PROBLEM.

 

A couple of weeks ago I noticed that GTA online was very laggy (about half the fps I usually get), but sometimes it would just double the fps before dropping it back.

Then I started noticing problems with CSGO as well. I play on low settings and the laptop could easily push 200fps. Now I get half of what I used to get, but as with GTA, sometimes it just randomly goes back to 200.

After futher investigation and reading many online threads I found out that for some reason, whenever the CPU is at a very high temperature (above 90*), the game runs at 200fps, but when the temperature drops and stabilizes, the game goes back to ~100fps for no reason. (You would expect the GPU to throttle if the temps are higher to lower)

This behaviour is very weird, since I have checked and yes, it's the Nvidia GPU running, not the integrated one and the GPU doesn't seem to throttle. It can maintain clock speeds ~300MHz bigger than the base clock.

Also weird is the fact that neither the CPU nor the GPU reach anywhere near 100% utilization (maybe the GPU reaches 70-80, but the CPU never goes above 30-40). 

I would like to emphasize the fact that it was working fine up until a couple of weeks ago and I do not recall installing any windows or BIOS updates before noticing the performance hit. I did however update to the newest everything (updated all drivers and the BIOS), but nothing seems to work.

This bug can be easily reproduced by starting CSGO, going into a deathmatch and waiting about one minute for the CPU temperature to drop. You can see the CPU temp go down in GPU-Z, but there is no sign of lower performance in any of the GPU graphs, it's just the fps that drops.

I've had the laptop for about 3 months now. 

Anyone else who also experiences this?