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You may also be interested in the Teensy 4.0. It is single-threaded (one CPU core), but it executes two instructions at a time if possible and runs at 600 MHz. Beyond that, I only know of the ESP32 as well, for genuinely having two threads. Beware, if you want to design a product using that there might be extra hurdles with the FCC/whatever your country has ...


ESP32. Dual core 240MHz, plus an extra XLP state machine. Cheap and easily available on eBay/Amazon/Ali Express etc. And with full Arduino support.

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