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Dual gfx at x8 speed

hello
my motherboard support sli and cfx but they say in dual gfx mode the speed will drop from x16 to x8 I need to understand the difference in performance between dual gfx cards at x16 and same but at x8 ?

thanks
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  1. Best answer
    The difference in performance from x16 to x8 isnt much only about a 5% performance decrease from x16 to x8.

    http://www.tomshardware.com/reviews/pci-express-2.0,1915-9.html

    This will show you there isnt even too much of a difference in performance going to even x4
  2. Best answer selected by mdk4ever.
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