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Would a PCIe 2.0 X8 slot have enough bandwidth for a NIC with two 10 Gbps connections?

From what I understand, each lane on a PCIe 2.0 card is good for 4 Gbps, so 8 lanes = 32 Gbps, right? Is my math correct?

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up vote 1 down vote accepted

Your math is correct. I doubt you'll be able to max out both connections in both directions regardless, but the PCI-E bus to the network card won't be the limiting factor.

You should double-check to make sure your motherboard doesn't have choke points between the CPU and the slot though. For example, if they share a PCIe 2.0 x8 path with the hard drive controller, that could be an issue.

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congrats on 10k on the third site on the network, David! – Sathya May 7 '12 at 8:52

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