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In theory, yes.
If the card has Universal AGP with two notches, then it should work in an AGP 2.0 (1.5v) or AGP 3.0 (0.8v) motherboard slot. So putting newer cards into older AGP 2.0 mobos should ok.
However, if the card is a dedicated AGP 3.0 and just has one 1.5v notch, then it may not work in an AGP 2.0 mobo.
The other problem, will be trying to use AGP 2.0 cards in AGP 3.0 mobos. Whether this works will depend on the connectors on the card and the mobo.
I would assume most manufacturers will adopt the Universal AGP connectors for their cards to ensure maximum backwards compatibilty.
HTH
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