Rpi 4 is 28nm, earlier models are 40nm. https://www.raspberrypi.org/blog/raspberry-pi-4-on-sale-now-from-35/ https://www.raspberrypi.org/blog/raspberry-pi-4-on

Rpi 4 is 28nm, earlier models are 40nm. https://www.raspberrypi.org/blog/raspberry-pi-4-on-sale-now-from-35/ https://www.raspberrypi.org/blog/raspberry-pi-4-on-sale-now-...