The 4870 and 4890 have a known issue where any program that loads the
card past what AMD imagined was "typical" can *easily* overload the
VRMs and crash the thing. Furmark, OCCT -- these will crash the card
*instantly*.
The character creator is easy to render but for
that same reason causes sky-high framerates that, yes, overload and
crash the card in the same way.
The fix? Enable vsync. That
will cap your framerate at your refresh rate (60 if you're on a LCD) so
you don't have the card stupidly trying to render 1000 fps. No more
crashes... Until you hit a bug or something, anyway.





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