A japanese company is working in a Raspberry Pi Zero cluster with 16 nodes, in a very small board.
I guess we will be able to work with Mathematica and WL on it, hope gridMathematica works on it in the future… while we can’t run Mathematica Kernel at a videogame consoles at home ( Mathematica at PS3, PS4, XBOX ).
Yes, nice board, the company is actually needs that to develop a Raspberry Pi module called the Actbulb for computational sensing and data analysis. In order to perform internal testing they decided to make things easier by developing a board to allow them to plug in sixteen Raspberry Pi Zeros. Another link: RASPBERRY PI ZERO CLUSTER PACKS A PUNCH and image:
As a matter of fact for a home/hobby HPC, or even for development environment, just one standard PC gamer board with GPU would be faster than any set of Pis.
The cool thing here is to set something cheap and didactical I guess, for class, IoT, and practical tests. Moreover there is the question of low power requirement, small size and price. This is a powerful idea, it gonna evolve!
I saw someware that this board to set the 16 Pi Zeros would costs around US$ 100,00…
If a powerful HPC is needed try something such as NVIDIA Tesla or that crazy thing from Facebook: