That game keeps crashing and wattman restores to previous settings due to system failure.
I have done clean install with DDU. My settings are
Yes the maximum is in normal operating range. This is not the same as upping the voltage. It only raises the power ceiling. It is dynamic so it only uses more power if needed.
That did not solve the issue. I have the same issue with all my 3D games GTA5, NO MAN'S SKY, PROJECT AURA, STARCRAFT 2 etc..
I have updated to 18.12.3, the same.
I give you my dxdiag and I have disable fast startup, maximum power settings and DVR disabled too and I have run the OCCT utility with no error I read that from elsewhere.
I would try that card in another machine. If you have same problem, likely a bad card. If the card works, then likely a power issue, but if you already checked the power supply then more likely the card will be the issue. Try it in another machine, if you can't then just try to RMA it, if it is still under warranty.