Sorry to disappoint really, but tri-sli 470s won't cut it in terms of 3D and surround.
Its way too much for the 1.28GB memory.
You will need to keep the games at 120fps for best experience, and to do that, you will have to lose AA completely, and most likely, DX11 in many games which support it.
I used to have tri-sli 470s and was playing at 6000X1200, and in many games I could not reach a consistent 60FPS with details on high and any form of AA.
You are trying to get 120fps at 5760X1080, which requires much more memory than these cards can deliver.
You'd be better of with 2D surround vision...and even that would be a performance hit, but not nearly as drastic as 3D surround vision.