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.
Crysis 3 is the game that pummels high-end GPUs. The Galax GTX 980 HOF comes closest to managing 60 frames per second at 1080p, yet it'll take more than just a hefty overclock to achieve 30 frames per second at a demanding 4K resolution.