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PCI Express X8 VS X16

Hello,
What performance hit is there between a PCI Express X16 slot running in X8 versus X16? The MB is set to X8 due to crossfire setup originally (Dell XPS 630I) and I have a single GTX460 card now. Just wondering how much performance I'm losing on that slot.

Thanks.
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  1. Best answer
  2. Thanks for the link. That answers the question for me; no need to replace a perfectly good motherboard.
  3. Best answer selected by Ceniel.
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