They need 3D CPUs, but not horizontal, vertical.

In other words, you can't stack cores like pancakes. However, if you accept thickness you could line them up like books on a shelf. Place them like the fins on a heat sink. The material between (not air) would take the heat away.



The Jedi Master


The anteater is wearing the bagel because he's a reindeer princess. -- my 4 yr old daughter