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What does the screen look like when your PC crashes ?
 
What are the Temps you are seeing ? Room, CPU, GPU
 
Which Monitor & settings do you use ?
 
Have you tried lower settings in the game or different resolution on your monitor ?
 
Which:
game(s) & settings in your games
are you playing online -
which game host -(steam ...) Or are you playing standalone on your PC
web browser

Would second what everyone else said, try in a different system if possible.
 
You can try the automatic artifact scanner built into OCCT https://www.ocbase.com/ but it sounds like the card is very unstable already. You can also use OCCT to test your CPU and general system stability, just keep an eye on temperatures if you use it. 

 

kougar
Would second what everyone else said, try in a different system if possible.
 
You can try the automatic artifact scanner built into OCCT  but it sounds like the card is very unstable already. You can also use OCCT to test your CPU and general system stability, just keep an eye on temperatures if you use it. 

Cool, I didn't know this software... It crashed in less then a minute, said there are 72 errors but doesn't tell me the errors. I googled it and it seems there is no log?
 

Tested with STR monitoring with OCCT, half the screen got black, didn't show any errors but crashed.
 

 

 
 
 

HeavyHemi
What was being asked before, was if you had an entirely different PC you could test the card in. Not the same PC with a different OS.  Your GPU is exhibiting all the signs of failing. It could also be the PSU. What happens if you manually underclock both the GPU memory and the GPU core by 200mhz? If it is more stable that pretty much confirms it is the GPU.

 
Oh I see, I don't have acces to any other hardware to test.
 
Just tried it, started at what you said and went all the way down to -1000MHz with the memory, it felt a bit more stable but still crashes. The difference is that it was crashing immediately but this time it took ~2 minutes.
 
With these results, are we sure there is nothing I can do? I'll have to sell a kidney and buy a 3070 lol... Prices are crazy with the pandemic here in Brazil, this is the last thing I needed....
 

Ok try this maybe, uninstall evga precison if you have it installed, install MSI Afterburner, its much more stable, while keeping Hemis suggestion for the small reduction in clocks of -200 on the memory AND the gpu..... reduce your in game settings like shadows, AA, and textures to more like a medium, or high medium instead of everything pegged out max. Go into Nvidia control panel and go to your manage 3d settings section, then setup specific settings for your game under the program settings tab, just add one for now to try with. It may be under the list already or you may have to manually add it, either or. Set the Vertical sync to adaptive for now, the max pre-rendered frames to 3, DSR to off and power management to maximum power. For now, just turn off the AA, Anisotropic, ambient occlusion, texture filtering to quality should be fine, and leave the vr off or use the 3d app setting. Save those settings and go to the global tab and set that up too with very basic settings cause this setting is for everything that could reference your gpu for work, so you can do adaptive power setting, no AA, no Anisotropic, AO, etc...Ive found over the years its better to set each game up from the nvidia control panel and turn off these same settings in game and just let the nvidia driver run those settings direct. The only other issue may be the cards having issues with heat after running so warm for so many years, that will wear them out waaayyy faster. Heat is your number one enemy with electronics.....well, and pricing. Did you setup your windows power management options in the windows o/s itself? Anyway, i hope this helps some.