[quote]I have 5870s in CFX and eyefinity with three 24" monitors.
I'm pleasantly surprised so far.
I'm just getting started with this, so AvP is all I've used so far.
If you try DX11 in EF it's a slide show.
DX9 is very playable and looks outrageous.
So far I'd say there is no way you could NOT afford to use anything but CF for eyefinity. The horsepower demands are too great for 1 card in my early experience.
Actually I've been using one 5870 quite successfully at 5856x1080 (After bezel comp) on all games. A couple of them I have to kick the settings back just touch (Crysis Warhead, Dirt 2, Arkham Asylum) but for the most part my 1 card has been playing high settings on all games in eyefinity. I'm just considering a second card to max out all the games in a couple months when I can afford it.
Bioshock 2, Borderlands, call of duty mw2 and a few others I have tested with 1 card vs 2 card in eyefintiy and when 2 cards are active I may get higher fps but there is stuttering and screen tearing. 1 card with a resolution of 5040x1050 seems to be fine in eyefintiy mode.. all those games I mentioned ran ok with 1 card, not great but certainly playable.