You get poor fps because the 7770s aren't particularly good cards. Two of them juast compound the issues the cards have. Cards with 2GB of vRAM struggle with very high resolutions unless the detail is turned right down. Two middling cards do not equal one good card.If at all possible i'd recommend rotating the monitors into portrait mode. I can't because their mounts are fixed (3x Samsung 22") but i find the missing vertical height is a nuisance and the full width across 3 monitors is mostly wasted.
Due to some issues with Vista and crossfire i get rubbish fps on 2x HD7770cu's so even tho' i have three monitors i just use the one and keep the others for forums/teamspeak/spreadsheets etc.
The game is designed around and for one monitor setups, so putting the cards into portrait is only going to make one larger looking display. Using an orientation tracking solution works very well. In landsacpe mode setups, it can really add to the immersion as 3 monitors gives you the feeling of peripheral vision. Headtracking gives you the verticality.
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