Sudden performance loss??

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11 Jan 2016
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Just built a brand new gaming PC. I7 8700K, Aorus Extreme 1080 Ti, Trident-Z 16GB 3200mhz Ram. This is the first time building a PC myself.

I can run Firestrike Extreme and Unigine Heaven for as long as I like, with stabile temperatures and no drops in performance. GPU never goes above 70C in Unigine Heaven, even after 30 minutes. CPU peaks at 65C in stress tests @4.8ghz.

Running Practice mode in the racing game Assetto Corsa, on Laguna Seca with the LaFerrari roadcar, I'm running at a capped 150fps (to avoid screen tear on my 165hz display). But after about 20 minutes, the framerate will drop to between 25-70 fps.
Exiting the game, the problem continues to affect ALL programs, with the system unable to generate more than about 35 FPS in any application, apart from the Firestrike Physics test, wich only tests the CPU (getting 65-74 FPS no problem). Both my GPU and CPU clocks and temperatures remains stabile the entire time, no sudden drops or spikes. Rebooting the system gets everything back to normal.

As mentioned above, I can run stresstests and benchmarks for as long as I want, with absolutely no performance drops. I've already tried different Nvidia drivers and updated my motherboard BIOS, with no change in Assetto Corsa. So is it a problem with the game or hardware???
 
Found the cause of my problems. It was the Gigabyte Aorus Graphics Engine overclocking software I had been running in the background. I didn't overclock my GPU, but I used the utility to control those horrid RGB LED's that sits on my GPU and motherboard. After uninstalling Aorus Graphics Engine, I have had no more problems with framerates or performance.
 
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