Note that Nvidia later decided not to produce a QPI chipset. Instead, it focused on discrete GPUs and the Ion platform. At that point Intel was left fighting a lawsuit that never needed to be filed.
Hard to say what Nvidia would have done had Intel not filed the suit. Perhaps Nvidia knew their hand was weak and decided not to waste the money designing something they knew they couldn't sell. I think Nvidia's previous posturing was just bluster trying to force Intel to back off.
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