I was looking around on google for the possibility of building a little cluster out of those boards, and some people have done it indeed
http://www.owncluster.de/2015/07/08/...na-pi-cluster/
http://www.jeffgeerling.com/blog/201...rry-pi-cluster
That might be complex to achieve but interesting to play with, in the end it should be fully controlled as a single node but have dozens of cores and a large stack of RAM depending on how many of them you cluster together.
But then by accident I stumbled on a site with even smaller boards... have you seen the NanoPi's?
http://www.nanopi.org/index2.html