Munkeh111 on 28 June 2013
Just looking at this graph http://www.geforce.co.uk/hardware/desktop-gpus/geforce-gtx-780/performance
You are going to struggle to match the performance of 2 580s in just 1 card, especially at $400.
A 770 may just about match the performance and that is just over $400. I think you are going to struggle to get great performance across 3 screens with that, but it should certainly be alright.
The 770 is the card that I would be looking into if I was you
