That's fine for games other than Arma 3 (racing games in particular), but there are
no gpu/cpu combinations that will allow you to run a triple screen setup (e.g. 5760x1080) with ultra settings at anywhere near 60 fps.
Look through this thread for Helo's Arma 3 benchmark mission:
http://forums.bistudio.com/showthread.php?151794-ArmA3Mark-Benchmark-your-ArmA-3
I ran dual 780 ti's till recently and they struggled to give me a solid 60fps (no dips) at 1080p. With 3 times the pixels, I can't see anything being able to drive it at max settings, unless you're throwing something crazy at it like quad 980s or something daft. Even my dual 980s are having issues at the moment, so quad sli probably wouldn't work either.
Arma 3 is the modern version of Crysis in regards to testing video gaming hardware.