It's sounding like it's using a Tegra X2 but custom. That put's it near base XBO.
This is a system with Dragon Quest,Pokemon,Monster Hunter,Shin Megami Tensei. That alone it has already won Japan before it's even out. They are manufacturing hype for Switch in the same way they did Revolution (Wii) and it's working. I think this system has potential to be a big seller. Don't think Wii numbers but PSP/GBA numbers. Nintendo has learned from Wii U and doubt it will cost more than 349 at max. I do think it will start at 259 for system and dock and 349 that includes the grip and digital copy of Zelda.
So just because its custom give nvidia the ability to increase performance by factor 2-3 without any heating and energy problems ? Lol. Tegra x2 is already all their tech combined. more is not possible. At least not at a priecepoint thats does not have 4 figures.
Apple is pushing the ARM SOcs really hard and even their a9x is far from beeing competitive with the xbox one. And the a10x and a11x wont either. They wouldt need to make it at 2nm or something to achieve that :D Thats may happen in 3-4 year, but not 2017.