@vantablack the E10k was an amazing machine. Back when I worked for Sun, I attended the service training for it when it came out. It was very different from other Sun machines since it was based on a design from Cray. SGI bought most of Cray, but Sun got their SPARC based stuff.

The initial model had a maximum of 64 CPU's and 64 GB RAM, on 16 CPU boards.

You also had a way to electrically separate sets of CPU boards into domains that could run separate OS instances.