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As Peter said, most Radeon 7000 support dual screens on thier own, but they must have the necessary outputs on that card to do so.
Also, any PCI card, with the exception of the Voodoo and Voodoo2, along side another PCI or AGP card should be able to dual display. The reason these are exceptions is because these were the only PCI cards that were ever made without a 2D element (They are 3D accelerators, not Video cards).
A Voodoo3 and a GF4 should have worked without a problem, as long as they worked fine seperately. May have been a fault of outdated drivers from 3Dfx going under. I'd offer some advice on that, but its probably an out-of-date problem and way beyond troubleshooting now.
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