Having issues with my SLI 980ti in a couple of games, it's the blue squares/lockup crash for Witcher 3 & Atilla.
It passes benchmarks fine, leaving them for quite a long time - Firestrike, Heaven/Valley which makes me think it may be either software or potentially clock instability related (but they have been a number of benchmarks easily).
So far I've done a driversweep, disabled the audiodriver/no GFexperience or junk & downclocked slightly (from 1450 to 1400) - this I'm testing now to see if it helps, but I'm unsure if this may be a game specific issue, a hardware problem or maybe a driver issue.
Power for the two cards was in the 80's, heat in the low 70's.