What\'s the difference between running CrossFire on x8/x8 and x16/x16?

i have 2 7850s and i am not getting the amount of performance i should be getting so i was wondering if it was my motherboards fault and if i should upgrade to a new one? my mother board is an asus p8h77-v le and it has on slot at pci 3.0 x16 and the other at pci 2.0 at x4. i was think that this could be aproblem but i am not sure so can ayone help me with my performance issues.
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