Ok so been having problems with this card a lot....not constant..only time to time....i did everything...DDU driver install/undervolt/custom fan profile and the problem was still there.....everytime it was in load i would had get a crash.
(PS: i have a custom curve on fans...my card never reached higher temps than 70 degree C).
So i checked the internet with similar problems and i found a lot of topics ....i tryed what ppl said it would worked for them and still didnt worked for me....so im gona tell u what i did and fixed my problem.
Since my card has 2000 MHZ frequency(VRAM tuning)....i lowered it to 1900 MHZ and started testing with unigine heaven and furmark.After testing about 3 hours with the programs i didnt had a single crash when before i would get crash on the first preset of unigine.
Hope this will work for u also....take care!