The brain also has around 100 trillion connections. In other words, the average fan-in/fan-out of a real neuron is on the order of 1000. No digital circuit can

The brain also has around 100 trillion connections. In other words, the average fan-in/fan-out of a real neuron is on the order of 1000. No digital circuit can come close to this because there's not enough real estate on a 2D chip to route the connections (although chips are moving into 3D). For now, that kind of fan-in/fan-out has to be simulated sequentially. https://www.scientificamerican.com/article/100-trillion-connections/ https://www.scientificamerican.com/article/100-trillion-conn...