We have a growing lineup of SystemReady ES certified hardware that will make good OSS upgrades. New platforms on our LX2162A based SOM will be especially good for this application.
Do they like multi-"socket" settings?
The number 32 is important because a stack of boards should look like a Thinking Machines CM-2a (http://www.corestore.org/cm2a.htm) and each CPU would control one LED (or three - Octavo now has a 3-core, two puny, one even punier, part, ending up with only 10 nodes per board).