yes and no. most games will run with 3 monitors fairly well, just dont expect to max out all the detail settings in more demanding games. If you want to max out games across 3 monitors you will want at least 3gb vram and 2 top tier cards like 670's 680's or 7970's. even then they will not maintain 60fps will full detail and AA across 3 monitors, but should be playable.
actually the 660ti sli is little bit over a 680 do some research before commenting