One thing that does suck about these rigs is that they do not run very stable when fully populated (ie all 16 cards installed).
This is very dependent upon power supplies. You need a beefy PSU with stable 12V rails in order to keep the amperage even to all 16 cards.
Hmm, do you have any recommendations. Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu but I'm thinking of buying something more beefy. I have in mind the AX860 series.
Just pay close attention to the 12V rails. I am using a couple older PC P&C 750W PSUs, but these are not built anymore. I also have a 1KW Coolermaster Gold Series that I use to power two full rigs.
Hmm, I too use a 1K psu for a full rig but it is still flaky, so I'm not sure if the power supply is to blame though. I bought another PSU - Corsair HX850 that will replace that Seasonic GS550 that is currently powering (so far so good) a full rig.
I should mention that the 1K PSU is not 80 plus gold rated (more like 80 silver) but that should not matter as it only affects efficiency at the wall.