PCI Express 2.0 x16 vs PCi Express 2.0 x8

can someone please tell me what is performance difference between crossfire(two amd 6970) setup using PCI Express 2.0 (x16,x16) vs PCI Express 2.0 (x16,x8)? thank you for your help!
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  1. You will see a 2-4% performance decrease running in 16x 8x as opposed to 16x 16x. Nothing really noticable. I would go for which ever motherboard better fits your budget.
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