So I just did a little test with Valley Benchmark. Maybe someone is interested in it, so I tagged all of you.
3440 x 1440
AVG. FPS: 72
Score: 3011
Min. FPS: 32.7
Max. FPS: 141.9
2560 x 1440
AVG. FPS: 92.5
Score: 3870
Min. FPS: 37.4
Max. FPS: 176.0
Difference as percentage:
AVG: FPS: 28.47%
Score: 28.53%
Min FPS: 14.37%
Max FPS: 24.03%
Test System:
Intel Core i5-4670 @ 3.4Ghz
4x DDR3 Dual Channel RAM @ 1866Mhz XMP
Gigabyte G1 GTX 980 SLI
Gigabyte G1 GTX 980 SLI
Samsung 850 Evo 1TB SSD