if you have 4gb 770/680's... then sli for sure. if you have 2gb keplar's... ugghh... not enough vram for the games i play... just get a 780 then. sli keplars are insanely powerful but that power is only useful for maxed out 1440/1600p or triple monitor gaming and i can tell you for sure... forget the 60sec benchmarks that sites give you... 2gb of vram is just not enough at those resolutions fully maxed out in games like ultra modded skyrim... crysis 3... 64man battlefield 3/4.