I've been testing Sniper Elite V3 more it seems it needs a lot of voltage to keep this game stable even at stock clocks. even with cf disabled it crashs to a blackscreen. when i put +100 on the voltage the game doesn't crash. tested both cards separate, and i get the same result.
I was playing it last night and had no issues. My card is at 1100 core and stock ram with stock voltage.
It bored me after a while though but no black screens or crashes.
Edit - I was playing Sniper Elite III if that's the same game ?