For anyone interested, here is a nice little demo of how 3M uses the Cointerra boards/chips to demonstrate 2-phase immersion cooling.

Video from 3M booth at Supercomputing 2015 (SC15) in Austin:
https://www.youtube.com/watch?v=a_vJbGgxPTU

Cointerra chips have been overclocked to 750W this way (instead of 500W each), but not specifically in this demo as far as I can tell.

Interesting to see the Cointerra boards being used by supercomputing folks to see what would be possible if chips would be a tad bit larger than what they are used to and cooling would be different than what we use today (air, water, chillers, etc).