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Currently ARM processors are being designed in Boolean Logic and implemented in CMOS gates. Threshold Logic is a superset of Boolean Logic. Any Boolean function is a Threshold function, but every Threshold function is not a Boolean function. The worst case Boolean gate count is exponential. The worst case Threshold function is linear. The Donut computer experiment showed using the same technology, the Threshold gate implementation is 30% smaller than the Boolean gate implementation.
Tunnel diode circuits have a speed power product 100,000 times lower than CMOS. At the same speed, tunnel diode logic runs cold to the touch vs the overheating problems with the Rasbery Pie3. In the 80's General Electric was selling ultra-high speed logic (20 GHz). Newer technology uses Resonant Tunnel Diodes (RTD).
Keeping the same design but implementing in threshold logic using RTDs would provide the same functionality with a greater speed and much lower power consumption and significantly less heating. I tried to get a friend at AMD to design and build a 700 GHz Pentium chip 30 years ago. Their silicon people refused to try.