Don't the cores have to be the same variant to do that? Similar limitation as SLI i thought, ie you can crossfire a 3850 and a 3870 but not a 2900 and a 3870. Are the 48XX's going to be the same core as 3000 series?
them why can you have a 2900xt and 3870 in crossfire.
its either 2900 onwards on nothing i'd say
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