QuintLeo- All the more reason for people to be getting away from ATX power supplies. They are over-priced, and under-built. I think it's past time everyone stops pretending they'll ever re-purpose 20x ATX PSUs for anything, lol.
I priced it out and with my 1 MW facility it would have added at least 100K USD to the overall build out cost. I'm willing to do a lot of work to get that. Most of that would be in the overpriced power supplies that are bundled with the miner making the overall cost per ghs that much more. Saves money ongoing because I can guarantee you my server power supplies are more efficient than say the ones in a S4. 1-2% savings of 1 MW let alone 2 MW will add up quick.
The key is the automatic wire cutter stripper machine:
https://www.youtube.com/watch?v=3vb0RM1xMCwI liked the screw terminals of the S1 but the plug and plug of pcie on both ends using the breakout boards allows for easier swapping of equipment. Which, when mining on an industrial level that is pretty much an ongoing task.
Older pic showing clean pcie install:
http://i.imgur.com/E6Ju4Us.jpgVery nice farm, and excellent choice of PSU. There is no better, in my extremely biased opinion.