The one that was most interesting to me on bridging the CPU and memory gap was Venray's TOMI:

http://venraytechnology.com/Strategy_Papers.htm

https://www.edn.com/design/systems-design/4429530/Two-Views-...

Their site is in a state of rot, though. That might mean they didn't make it anywhere. They did build something brilliant, though. Hopefully, someone licenses and/or acquires it that will crank out more at lower cost like Adapteva was doing. The second article has a nice summary of what it's doing along with another interesting piece of hardware.