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When you upgraded the BIOS, did you also upgrade the Chip-set?
Version 188.8.131.520 2017/11/0186.56 MBytes
Management Engine Interface
Improve system stability
If you have installed Asus Suite III, try disabling it or uninstalling it to see if the problem is fixed. May want to run MEMTEST86 to be sure your memory RAM is good. Also make sure your Windows 10 is fully updated via Windows Update.
When you uninstalled the Nvidia GPU Drivers, did you use DDU (Display Driver Uninstall) in safe mode. This is recommended to remove all traces of previous Nvidia, AMD, or Intel drivers from the system. You also may want to check your temperatures on the GPU card and check your PSU outputs while running the games to make sure everything is within normal range.
So I've done everything you said and apparently my windows was really outdated ( I remember disabling the updates from services because it was annoying ) and now I have the latest version of windows 10 pro .I also installed all the newest available drivers for my motherboard and then re-installed the video driver. Now I tried playing some games and I didn't get the crash anymore when I tabbed out or left the game. Also I noticed a temperature change to my GPU which before was running at about 75-80 degrees C and now it tuned down to 65-66 in high-demand games . Thanks for helping out !
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