Could be biological: actual neurons; or using protein folding to do computation. Meanwhile 28nm remains the cheapest per transistor process - the first time sm

Could be biological: actual neurons; or using protein folding to do computation. Meanwhile 28nm remains the cheapest per transistor process - the first time smaller nodes got more expensive (due to heat, mainly). In the short-term, we might go for larger dies, clocked lower, to get more computation for less power. Perhaps all that wasted hardware will get used more efficiently (eg Metal and Vulkan).