First of all, here is my config:
Graphic card: R9 290X (4Gb Memory)
Processor: Core i7 3770 Ivy bridge
The problems seems to be with graphics settings.
I tried to set graphics options to defaults and after that it seems to work very well but it's really ugly. So i tried to reset all settings to the maximum like before, but my pc crashed very quickly a few minutes later.
I try to see how this problem occurs by disabling some graphical options step by step, but it's very long because my pc crashes each time i try to play.
Did you do some graphical tweaks since the previous build of the game? It worked like a charm before the v0.50...
I can't play Dayz anymore and it makes me really sad :'(