PCIE 16x + 4x vs PCIE 8X + 8x Crossfire!

Hi, planning to upgrade my motherboard for crossfire suuport in the future, so for some motherboards i found it supports crossfire with one x16 pcie slot and one x4 pcie slot, and for other motherboards the 2 pcie works runs @ x8, so i wonder which would be better for running the crossfire cards?!
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  1. Hey :)
    16x4x is the worst performer for CrossFire,and its not recommended if you want to use 2 cards.Dual 8x/16x are good though and perform well.
    Here is a good review which compares all
    http://www.tomshardware.com/reviews/crossfire-pci-express,2095.html
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