Abit AB9, PCI-E 2.1 and gfx card bottlenecks?

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Hi,

I have an abit ab9 mobo and I'm looking at getting a new gfx card.

I can't tell what version of pci-e my board has but I'm guessing it's 1.1 as I bought it in January 2007, just as 2.0 seems to have been introduced.

The cards I'm looking at say they are 2.1

I have read this would not stop them working but would it cause some sort of bottleneck if I use a pci 2.1 card in a 1.1 slot? The 6950s look tempting, going from a 3870.
 
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