If you can put enough processors and memory close enough, it seems as though you should be able to model a few hundred or thousand neurons on each processor, to

If you can put enough processors and memory close enough, it seems as though you should be able to model a few hundred or thousand neurons on each processor, to assume the worst case. We've already moved past the need for neuron-level parallelism, so from here on the question is what order of magnitude of neurons can be modeled on a single processor. (Again, assuming the worst case that we have to model neurons to get intelligent systems before we can figure out exactly how to produce intelligence in a less simulation-oriented manner).