Ran soft shaders ultra with a GTX 780 Ti (full specs on my signature)
@ 1920x1080:
On ACM city, with soft shaders off and lowest settings, I get upwards of 600 FPS and I maxed out at 800 FPS.
On ACM city, with "ultra" soft shaders on and highest settings, I get around 20 FPS and I maxed out at 30 FPS.
Keep in mind that I get 30 FPS on 5760x1080 ARMA 3, and benchmarks show 20 FPS for max settings, 5760x1080 Metro Last Light.
I think this really shows how difficult it is to run this.
NASA computers do calculations, and they have no vídeo card.
This is really old, but modern supercomputers use GPU power for processing, à la cryptocurrency mining.
Albeit they're not your run of the mill 7950s, but still.