After messing around with a bad cube and swapping around power supplies,
I finally have a reasonably stable setup.  I found that my new Corsair 850 has a
weak or blown PCI port driver so I can't use both of the PCI outputs for
powering two Cubes. Runs one just fine.   Unrelated, one of my Cubes will sometimes
power-up in all "X" mode.  After a few extra power-ups (hot or cold, didn't matter)
and it runs for days (so far).

I use one instance of mining_proxy.exe running on Win-7 and
I have no efficiency issues. Blades are 99% efficiency, Cubes
at 97+%. Each Blade and Cube has its own worker, that may be what makes it
run correctly.  I would like to use a Raspberry Pi to replace the PC as a proxy, but not
if I need multiple Pi's for my current rig of 3 Cubes and 4 Blades.

-Mark