This was confirmed during the launch of the X. Reporters were told the GPU was the same, but the touchscreen itself received a minor upgrade to be more sensitive. The same reporters also said it felt exactly the same as the S.
Of course, this doesn't mean the production version won't have it, but no upgrade was mentioned at launch.
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You seem to be confident in your answer. How so?
Tegra X1 is a significant leap forward over the last generation chip. It's capable of significantly improving both autopilot and active safety systems. Since Nvidia's CEO is quite vocal about owning a Founder Model X, it makes sense to see Tesla as the pilot customer for the new chip.
Oh, well... at this point, anything will suffice.
As of now, Nvidia has nothing to do with Autopilot or safety systems. That's handled by Mobileye. It doesn't mean it can't change, but for now Nvidia is strictly for the center console, like your computer's video card.