
Adafruit ItsyBitsy M4 Express
Dev Board
High-performance compact board with ATSAMD51 Cortex M4F at 120MHz, 192KB RAM, 512KB flash, 2MB SPI flash, dual 12-bit DAC/ADC, 18 PWM outputs, AES-256 crypto, and native USB. Measures 36mm × 18mm.
Microchip ATSAMD51 ARM Cortex M4F192 KB512 KB23 GPIO
~$15View

Adafruit Feather M4 Express
Dev Board
High-performance Feather with ATSAMD51J19 Cortex M4F at 120MHz, 192KB RAM, 512KB flash, 2MB SPI flash, dual 12-bit DAC/ADC, AES-256 hardware crypto, LiPo charging, 21 GPIO, and native USB HID. Feather
Microchip ATSAMD51J19 ARM Cortex M4F192 KB512 KB21 GPIO
~$23View
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More to explore — popular traits shared by devices with Use Case: audio-synthesis.