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Need help understanding this behaviour in COD Modern Warfare

Joined
Aug 14, 2014
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Processor 5800X3D
Motherboard MSI Prestige X570 Creation
Cooling Corsair Hydro H100i RGB Platinum SE
Memory Kingston 32Go 3600MHz
Video Card(s) Nvidia 4090
Display(s) Asus XG27UQ + Asus PG279Q
Case Corsair Obsidian 750D
Power Supply Corsair RM850x White
Hello,

I hope this is the right subforum for this topic which is regarding COD Modern Warfare.
The issue is that from time to time, I would go from 130 to 100 FPS in the same scenarios. After troubleshooting, I found out the only explanation to be a lower TDP usage during those performance drops.
Here is what it looks like when the game is running as expected
high.gif

And where it is not
low.gif

Please note that on both cases, the CPU usage is below 20%, the GPU usage is around 97-99% while both display temperatures under control.

Here is what I tried so far :
- Cleaning drivers, trying several older versions,
- Enabling performance mode on driver settings,
- Sliding core voltage, power limit and temperature limit to the max on Afterburner,
- Disabling both CPU and GPU overclocking and resetting the motherboard to default settings,
- Making sure that the GPU was running in PCIE 3.0 x16 mode

I'm at a loss since this behaviour only happens in this game and clearly seems to be related to the lower TDP usage, which I don't understand is happening in the first place, out of the blue.

I would like to read some feedback regarding this, hopefully there is a simple solution :rolleyes:
 
Well I finally found the culprit and it is certainly hard to believe.
My gaming monitor is the Asus XG27UQ, which is GSync compatible. Disabling GSync on both Nvidia control panel and the monitor fixed those performance/low TDP usage issues.
Very strange :confused:
 
Nvidia control panel and the monitor fixed those performance/low TDP usage issues.
Very strange :confused:

Not really, any form of synchronization will limit the output of frames and therefore lower the power consumption.
 
Not really, any form of synchronization will limit the output of frames and therefore lower the power consumption.
While I agree, the goal was to limit the ouput of frames to the monitor's refresh rate, not randomnly like this. Unless I'm missing something, this looks like a driver issue to me.
 
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