- Tegra K1 is used in the NVIDIA Shield Tablet/TV, Nexus 9, and two Chromebooks.
- Tegra X1 is in the Google Pixel C and NVIDIA's SHIELD Android TV.
- Tegra P1 or a variant is rumored to be powering the Nintendo Switch
For TK1 there's a longer list of devices on Wikipedia. The additional ones are the Jetson TK1 development board, Lenovo ThinkVision 28, Xiaomi MiPad, Snail Games OBox, UTStarcom MC8718, Google Project Tango tablet, Apalis TK1 System on Module, Fuze Tomahawk F1, JXD Singularity S192.
It makes it even more crazy that both of the nVidia devices retail for under $200 but Nintendo's supposedly subsidised console costs a third more.
Nintendo hasn't subsidized a console for years (and has been rather public about that). And Nintendo includes a full wireless controller with rechargeable batteries, a TV display dock, and a tablet charger -- none of that ships with the Shield K1 Tablet (not even a cheap USB charger). And Nintendo's Switch likely uses the faster X1 chip, not the slower K1 in the Shield Tablet.
It's not really fair to complain about Nintendo's $100 higher price over the Shield Tablet, without mentioning all extra stuff Nintendo throws in for that price that the Shield Tablet doesn't include.