Im running SLI EVGA ACX superclocked 780's atm with the rog swift 1440p monitor. a alot of games are fine but there are some demanding games that i cant run maxed out with out having fps in the 30's, and that with or without slight stuttering depending on the game. when thats the case i usually drop a couple of things till i at least get an average of 50fps.
for example, i get witcher 3 running between 40 -70 fps and thats with most things on ultra, but antialiasing off, foliage render on v.high, shadows v.high, pop render v.high.
couple of odd small stutters here and there but mostly smooth.
im actually thinking about whether i should upgrade to the 980 ti now because i can see that these days, the games are starting to go beyond my cards at 1440p.