1. The x1 in the pixel is clocked down and alot less powerfull.
T-Rex 1080p Offscreen
Nvidia Shield Console (full potential): 118 FPS
Pixel C: 85 FPS
"When Nvidia announced the Tegra X1, it talked up the efficiency of the chip, lauding the process improvements and new GPU tweaks mentioned above. But how efficient is it? We were told that Tegra X1 hits peak power consumption of 10 watts when rendering an Unreal Engine 4 demo. That’s certainly impressive when you consider the Xbox needs 100 watts to do the same thing. However, 10 watts is still way too much for a tablet—most tablet processors consume maybe half that at the very top end."
For comparison: The a10Fusion consumes 4,5 Watt at maximum clock speed.
Yes but again, the X1 is Maxwell where as the one for NS is Pascal... The performance/watt gains are massive in comparison if we look at the GPUs that are currently avaliable.
Yea the A10 Fusion consumes less watts but ipads/iphones and etc also have more things to consume that battery. Such as cameras, better screen, higher resolution, etc. The Switch is Rumored to run at 720p and the benchmarks you stated were running at 1080p. So even if the Tegra is downclocked, the lower resolution will increase its performance... Also not to mention that the NS will not have most of the things that ipads/iphones do that would lower its battery.