[Dr. Spankenstein]

I would be skeptical of how consistent the performance between the two chips would be. As two card solutions are now, you can keep a hot clocker and shop around for another good card since the Crossfire clocks are dependent on the slowest card.

That is unless I am confused as to how CrossfireX works, which is probably the case...


*edit*- Reading further, I guess the HD 3870x2 would most likely utilize their Hybrid Crossfire idea. Like the ability to CF a 3870 with a 3850, it would dynamically scale the performance (though I am dubious as to how well).
I first though the idea of Quad CF via the HD3870x2 would be cool but my logical side see the potential for too much room for weak chips to drag the expensive video solution down. (Not like you could complain about having 4 GPUs working for ya!) I'd be more curious about R700.