For those of you who like to get your geek on (and rumour has it, they can be found reading this blog) the Computerphile channel just had a video interview with Steve Furber of the Human Brain Project who talks about the custom hardware that’s going to run their neural net simulations.
Furber is better known as one of the designers of the BBC Micro and the ARM microprocessor but has more recently been involved in the SpiNNaker project which is the basis of the Neuromorphic Computing Platform for the Human Brain Project.
Fascinating interview with a man who clearly likes the word toroid.
Mind Hacks 
This link is probably more representative of the sort of toroid he’s talking about in the video: https://en.wikipedia.org/wiki/Toroidal_graph
No I figure it is rather like this :
mathematica.stackexchange.com/questions/39879/create-a-torus-with-a-hexagonal-mesh-for-3d-printing
Physically the board is square, but in the network topology it has six sizes and they are all connected in the same way as the hexagons on the toroid.