That motherboard supports SLI, which allows you to use 2 video cards at once, increasing performance. PCI-E is the future, and it does offer more bandwidth when compared to AGP. If you want to use SLI, you will need to pay for 2 video cards. The x800Pro comes in a PCI-E variant as well, so you could just pop one of them in there. You don't need to use both PCI-E slots. PCI-E is meant for expansion cards in general, while AGP is video only.
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