As other commenter said, you can do similar things with analog. One team even built a wafer-scale model for simulating neural networks: http://citeseerx.ist.ps

As other commenter said, you can do similar things with analog. One team even built a wafer-scale model for simulating neural networks: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.464.1632&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.464... A stacked version of that in a 3D mesh could probably handle quite a bit of intelligence.