The Atmel SAMD51 or ATSAMD51 is an Arduino-compatible microcontroller chip with a 120MHz 32-bit ARM® Cortex®-M4 processor. It runs off 3.3V power.
Here are a couple models:
It can be programmed with:
Some boards that feature the SAMD51 include:
Read more at https://en.wikipedia.org/wiki/Atmel_ARM-based_processors