Dual 16x or 16x and 8x

i was wondering if a crossfire 7770 would make a huge difference if it was in dual 16x or 16x and 8x. My screen resolution is 1920x1080.
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More about dual
  1. Will you see a performance increase over a single? Yes.

    Will it make a difference if one lane is 16x and one is 8x? No, not really. The difference between 8x 8x versus 16x 16x is like 1-2%.
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