The game does not support eyefinity out of the box though you can get an acceptable 3 screen solution with an ini tweak. The main problem with it is that the hud is cut off but it is very playable. The game also has pretty good visual settings since it is a pure PC game as well as a built in FOV slider. I set mine at 85.
To get it to work on 3 screens
Go to DocumentsMy GamesChivalry Medieval WarfareUDKGameConfig
Open UDKEngine
Find the section [Engine.LocalPlayer]
Change
AspectRatioAxisConstraint=AspectRatio_MaintainXFOV
To this
AspectRatioAxisConstraint=AspectRatio_MaintainYFOV
Save and close
Then set your FOV in the in game menu. PS: I only have a single 5850 and this game is completely killing it. Need somewhat of a decent card for this one.
Couple of screenshots.



