It´s a good question though; when/if they get Eyefinity working on Crossfire if you can hook up two DVI-monitors on one card and the third on the other card. Would save the cost of the active DP>DVI adapter and "almost" make the second card free, at least when prices have dropped a little.
That is a different question than the OP had, he wanted to know if both cards could share the load in some means by using 2 cards even if they are not in crossfire.
But the answer to your question would still be no because even now with all current cards when in crossfire all the displays have to be on just 1 of the cards.
The day before I got my 5870 I hooked up my 4 monitors to my dual 4850's and I could not use more than 2 displays until i disabled crossfire and let the cards run independently.
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