THEY DO!
It even says it on the OCUK website, amoung other places:
I get really annoyed with people who talk before they think..
I get annoyed with people who are unnecessarily rude.
AMD's own specs say the 6670 is the maximum supported GPU for dual graphics because anything higher outclasses it. With higher performance discrete graphics, the performance isn't great, or won't work at all in crossfire. For an A6, the maximum supported is a 6570.
http://tpucdn.com/reviews/AMD/A10-6800K/images/dual_graphics.jpg
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