WOW!
All you guys with lots of expensive rigs.
I'm just a poor hobbist trying to make a couple of extra $$.
My pile of U1/U2/U2+ isn't photo ready yet, I have a new heat sink for those.  I'm calling it my "Ant Farm."  I'll post pics of the heat sink that I have.
Here's my single S1 in a case I built for it.  Added a pull fan to the back, tested power supplies in various positions for cooling, they seem to like being back-to-back on their sides
There will be hinged cover on the back soon but I wanted to at least test to see if the airflow was going to work right.
First pics are on the bench while testing power supplies, installing heat sinks, and testing overclocking.
Unit is overclocked to 393.75 and with the cheapie power supplies, draws just a little over 470W when hot.  Draws 460W when cool.

Pictures of the initial layout of the "Ant Farm" and the heat sink I'm using.