We’ve just seen Nvidia's APX CPU, that will be branded Tegra, and we’ve seen that this new application processor can run Windows embedded 6.0.

After a few questions we’ve learned that the same chip could theoretically support X86, but someone would need to develop software for such a task.

So, there is your answer, with an X-86 license Nvidia could support and run Windows XP. It is possible from an engineering point of view.

The answer to all problems is simple, if Nvidia gets an X86 license you have a fourth CPU, VIA being the third.