Crysis 3
Crysis 3 is a beautiful-looking game that continues to tax high-end systems. We've FRAPS'd a 30-second section near the start of the game, with lashing rain, numerous reflections and full DX11 pomp on show.
Radeon R9 290X and GeForce GTX Titan/GTX 780 produce near-identical scores in the demanding Crysis 3, too. Let's zoom into the per-second figures for more clarity.
The Titan is a touch faster, though playing through Crysis 3 on the two GPUs reinforces the notion that both mete out equivalent gameplay.