Status update: After troubleshooting with Dell-Cares, the fix for this was to have the GPU replaced through our warranty support. 
I know this thread has been dead for about a year but yesterday I have started to have the exact same problem. Done a million things but the GPU keeps crashing as soon as I start a game or stress test. I think my 3080 is dying on me. Just run out of warranty as well. I was wondering how you solved your problem.
Aurora R11, 3080 screen flickers crashes to black screen #2