Crysis 3
Crysis 3 is a beautiful-looking game that continues to tax high-end systems. We've benchmarked a 60-second section near the start of the game, with lashing rain, numerous reflections and full DX11 pomp on show. 4xMSAA is enabled at 1080p and disabled at 4K.
We've yet to come across a single-GPU card that can run Crysis 3 at our settings with an average 60fps. Both the Classified and HOF get close, very close, but neither is powerful enough, on their own, to make the same game playable at 4K.