(In reply to haro41 from comment #117)
> ...are this craches more frequently with VSYNC enabled?
> 
> If yes, it could be the same thing like this bug:
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=110777

vsync is defintely on for both Stellaris and Hearts of Iron.

I looked over the bug report you linked to.  It is very interesting and I will
follow with interest.  The next time I play Stellaris or Hearts of Iron IV, I
will have to see if I can record my memory frequency values to see if they are
indeed not moving off the base frequency under low load with v-sync enabled. 
The problem manifesting under low load would explain why I cannot replicate the
problem while running Unigine Superposition.

I began to wonder if powerplay and the frequency at which the chip and memory
were operating were not the problem after reading the following bug report for
Vega 20:

https://bugs.freedesktop.org/show_bug.cgi?id=110674

Last Friday, I attempted to capture the operating frequency and temps, but my
attempt utterly failed.

I will disable v-sync and see if that improves and report back here.  If I
manage to capture frequency data, I will report back here and may be your
thread.