Do you need a pci express 2.0 mobo for a pci express 2.0 card?

Do you need a pci expreses 2.0 motherboard if you get a pci express 2.0 card? I am looking to upgrade to a nvidia 9800gtx card. I already have 2 7600gt's in sli. I currently have a asus a8n-sli deluxe motherboard.
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