As it turns out, the speed of the nForce4 SLI X16's link to the CPU may help us predict whether the chipset's additional PCI Express lanes will help SLI performance. Increasing the number of PCI Express lanes allocated to each graphics card from eight to 16 boosts available graphics bandwidth from 2GB/s to 4GB/s in each direction, going to and from the graphics card. However, the nForce4 SLI X16's HyperTransport processor link only offers 4GB/s of bandwidth in each direction, so it can only fully saturate one 16-lane graphics slot at a time.
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