(In reply to Sylvain BERTRAND from comment #62)
> unstable power supply lines to the gpu if overheating is excluded?

It's not overheating in my case, but my PSU is pretty old (I'm waiting for
components for my new build to arrive, including new PSU). I've lowered power
limit (to 80W) and I haven't had any crashes yet. 

So, in my case the problem *might be* related to PSU. But I can't exclude (nor
confirm) possibility of driver problems with higher power states (until I have
a better PSU).

I'll report back if I have any crashes with new PSU or lowered PL.