It will be held back if you don't have X38/X48. You need two PCI-e 2.0 16X lanes to get the full benefit of Crossfire with these cards. The loss in Crossfire with two PCI-e 8X lanes is substantial, at least in my opinion.
I had a similar question for others. I have a P35 board and I'm thinking that I'll be held back if I don't go to PCI-e 2.0, considering the Crossfire test done and the final results. Am I right in my reasoning? Need to know if I have to purchase a P45 board or not. I don't plan on going Crossfire, so I won't need X38/X48, unless I can find an X38 used at a good price.
EDIT: OMG some people are stoopid!
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