According to a report by Expreview (via TweakTown), Nvidia's 8800 GTX and Ultra will be the only boards capable of running three-way SLI - that's providing you have a 680i or 780i SLI chipset, three PCI Express x16 slots, and a new three-way SLI bridge. The setup relies on the dual SLI connectors on the top of the GTX and Ultra boards, hence why the GTS isn't supported.

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