If 3D wasn't popular here we wouldn't have a whole set of sub forums for it :P But your question has been discussed here: [#13987]
However the short answer is here:
Eyefinity and HD3D are not yet working through the Tri-Def middleware and AMD Catalyst driver. AMD is working on it. The 6970 will give four 2D outputs (with an active adapters) and the 6990 will give five 2D outputs natively.
They will both only drive a since 3D screen. And, CFX is not yet working in HD3D, so the 6990 causes problems. I haven't tested in a while, but I will ask if there are updates to the CFX issues.
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