I am really tired of this now! I just bought the Sapphire Radeon R9 380 (Factory Overclocked) and EVERY single time when i try to play a game (except League of Legends) i get a blackscreen and i can just restart the PC! All the components in my PC are new. It can't be any hardware problem. I have got my System specs here as a PNG and my Mainboard is the ASRock B85m Pro3.
I forgot to say that i reinstalled my drivers, reinstalled windows, checked all my hardware and changed the tdr delay but nothing helped.