nope only on the 6 series cards can u run 3 monitors on one card and spanning only works on 3 or more monitors and you need to have a lot of vram for most games or you get wicked stuttering happening which kills your gaming experience and if you think about it gaming on 2 monitors would suck balls this is why
Why isnt Surround an option for 2 monitors? - NVIDIA Forums
my sli 670's are the first cards i have that game in surround good adn i tried on 480 sli and 560 448 core in sli the latter were pretty good at low spanning res but now my 670's play anything at any res the 2gb vram helps alot