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caffeinade said:

Nintendo is pretty cheap, they're not going to pay for all that silicon.
Physical size matters in mobile devices.
A base Tegra X1 has a TDP of 15 watts, not 20, meaning you'd have to cut it down even further to reach stock X1 power consumption.
The Switch uses an underclocked X1.

Xavier wasn't built for gaming.
It will only be decent at gaming by brute force.

Nintendo would be better served with an SoC that is custom designed for their needs.
And have a GPU that is balanced for the task at hand.
They'd probably want to find the optimal frequency for their architecture, 512 core will probably be too much to hit the sweet spot.
Also we don't know how Volta compares to their gaming architecture, in games (if they are indeed separate things).

Nintendo Switch's SoC is 232mm2.
Xavier is about 300m2.

That is roughly a 30% chip size increase.
However... 12nm is very high yielding anyway, so that increase in chip size should be economical for Nintendo.

Xavier most certainly was built for gaming, it just so happens it is good at other tasks as well.

With that in mind... I think the better idea would be to take Tegra X2, port it over to the 12nm process and dial up the clock rates, Pascal isn't a big deviation from Maxwell from a feature set perspective... But can hit higher clocks for better performance. (Plus improved Delta Colour Compression for a little more bandwidth.)