Currently The fastest Arduino compatible development is hifive1 with 320Mhz RISC-V MCU. This board family will be have 400Mhz Cortex M-7 MCU. Key features of MCU: - 400Mhz 32-bit Arm® Cortex®-M7 core with double precision FPU and L1 cache - upto 2Mbytes of Flash memory - 1 Mbyte RAM - 4 DMA controllers - Up to 35 communication peripherals - 3× ADCs with 16-bit max resolution - 2× 12-bit D/A converters (1 MHz) - Hardware JPEG Codec - Up to 22 timers and watchdogs (upto 200Mhz) - RTC with sub-second accuracy & HW calendar - Cryptographic acceleration* and lots more Board Feature: - Arduino UNO/MEGA form factor - SD-card with card detect feature - optional QSPI Flash upto 512 Mbit (133Mhz) - USB OTG - CAN Interface - Ethernet* - Camera Interface - Battery Charger - SWD Interface First PCB layout for Concept and hardware Verification is ready :)