The recently released nvidia 980ti (particularly the OC one) is a great card for 3.4k and 4K gaming, particularly if theoretically combined with a gsync monitor according to DF:
http://www.eurogamer.net/articles/digitalfoundry-2015-nvidia-geforce-gtx-980-ti-review
The Witcher 3, High, HairWorks Off, Custom AA
40.7 fps
Battlefield 4, High, Post-AA
69.6 fps
Crysis 3, High, SMAA
59.7 fps
Assassin's Creed Unity, Very High, FXAA
29.0 fps
Far Cry 4, Very High, SMAA
50.9 fps
COD Advanced Warfare, Console Settings, FXAA
96.9 fps
Ryse: Son of Rome, Normal, SMAA
45.6 fps
Shadow of Mordor, High, High Textures, FXAA
59.7 fps
Tomb Raider, Ultra, FXAA
66.0 fps
Those numbers are at
4K during gameplay and without directx 12 alleged improvements,
@iroboto confirm me I am not wrong here.
That's for those who are still thinking that next gen won't be 4K gaming + adaptive vsync tech...And we are still maybe 4.5 years before the PS5 and XBTwo...