Haha no worries I totally didn’t see what community this was in either so doubt the DDU process will be helpful. You could try another distro loaded onto a USB or even load windows to a USB and see if it’s still crashing on a different OS.
Are you able to load something like hwinfo to see what your idle temperatures are at? It’s possible that there isn’t good contact with the heat sink and gpu die that’s causing the crash. Should be somewhere between 30c and 50c idle depending on your ambient temperature.
Was the video card working well (i.e. was video encoding/decoding fine or whatever you used it for) before the switch?
despotic_machine