Just to give you an idea of the performance hit @7680x1440p on my main rig (5930K @4.5Ghz, 32GB RAM, 980Ti SLI 1260Mhz Core Clock/ 7492Mhz Memory Clock/ 1492Mhz Boost Clock , :
The Witcher 3 every setting Gameworks maxed/ settings ultra, AA on: FPS Avg: 39.719 - Min: 32 - Max: 51 (Very choppy)
The Witcher 3 Gameworks off/settings ultra, AA off: FPS Avg: 55.267 - Min: 43 - Max: 65
Dragon Age Inquisition completely Maxed to include AA: FPS Avg: 27.533 - Min: 14 - Max: 79
Dragon Age Inquisition Maxed AA off: FPS Avg: 43.786 - Min: 22 - Max: 82
The Division (mix of High/Very High/Ultra, gameworks off, maximum detail: FPS : Avg: 59.725 - Min: 28 - Max: 80
Borderlands 2 maxed: FPS Avg: 98.469
Crysis 2 maxed: FPS Avg: 76.603
Bioshock Infinite Guru3d settings: FPS Avg: 77.19 ((2560x1440p same settings 141 FPS)
Crysis 3 Very High 4xTXAA: FPS Avg: 39.428
Farcry 4 (FXAA): FPS Avg: 44.407
Watchdogs (FXAA): FPS Avg: 52.812
Metro 2033 maxed/ultra: FPS Avg: 34.54
Shogun 2 maxed/MLAA: FPS Avg: 81.3 (2560x1440p completely maxed to include AA 75FPS avg)
Hitman Absolution Guru3d Settings: FPS Avg: 69.43 ((2560x1440p same settings 121FPS)
Thief Guru3d Settings: FPS Avg: 69.7 (2560x1440p same settings 98FPS)
Tomb Raider 2013 Guru3d Settings FPS Avg:: 104.3 FPS (2560x1440p same settings 244FPS)
Attila Total War Max Quality Preset: FPS Avg:: 43.3((2560x1440p same settings 59.5FPS)
Payday 2 Maxed: FPS Avg: 134.742 - Min: 121 - Max: 136
SWTOR Maxed :FPS: Avg: 73.822 - Min: 46 - Max: 105