In a blog post shortly after the official reveal, graphics manufacturer NVIDIA revealed their custom Tegra processor was a core part of the new Nintendo Switch.
The post says that the Switch, due out in March next year, runs off "fully custom software" as well as new libraries, new advanced programming interfaces and a "revamped physics engine". "NVIDIA additionally created new gaming APIs to fully harness this performance," the GPU manufacturer announced.
"Gameplay is further enhanced by hardware-accelerated video playback and custom software for audio effects and rendering."
The development time reportedly took around 500 man hours, and the NVN API was supposedly created for "lightweight, fast gaming". It's not known whether that API will be usable for other mobile platforms, or what use it will have outside of development for the Switch.
NVIDIA didn't specify the model or specifications of the Tegra chip powering the Switch at this time, although given the 2017 launch date it would not be surprising to see it using the Pascal architecture that was made available to consumers in the GTX 10 series line earlier this year.