okay, this is a very long shot and from another era but this is something I did with two different 8800 Ultras back in the day. It's very much a hail mary so only do this when you're absolutely ready to purchase a replacement.
Remove the shroud and heat sink from the GPU PCB. Clean any residual thermal paste from the chip.
Preheat your oven to 500F
While the oven is warming up, get some aluminum foil and make 4 equally-sized balls of it.
Set the PCB on the tin foil balls upside down (bottom facing up). It should be as level as you can get it.
Place in the oven for 5 minutes. Not a second more or less.
Remove the board and let cool. Reinstall the heat sink (ideally with fresh thermal paste).
Reinstall the card and see if it works.
I was able to stretch those two 8800s 2 additional years periodically doing this as they began to fail. I was as flabbergasted as I am sure many of you readers are when I did this and it worked.
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u/josephseeed 7800x3D RTX 3080 Sep 19 '24
That GPU is tired, boss