I feel that Bitmain is skimping on the PSU. Assuming that they're using
Enermax ERV1000EWT-G 80 Plus Gold which is approximately 90% efficient at around full load (996W or 83A total on the 12V rail), the S2 would be drawing around 900WDC (1000WAC at the wall*90%) from this PSU. That's a 90% (900W/996W) continuous load 24/7. That's too close for comfort. A 1200W PSU (75% load) would be more appropriate. Personally, I prefer a 1500W PSU (60% load) for the S2; much closer to peak efficiency which is at 50% load.
Bitmain should offer an option to sell the S2 without a power supply at an appropriately reduced price so we could supply our own PSU just like with the S1s or get rid of the relatively puny 1000-Watter and use at least a 1200W premium PSU. The cost difference for them shouldn't be that much especially when purchased in bulk.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817194101yeah I don't need his psu nor do I want it. I have lots of quality 1000 and 1200 watt psu's they are running his s-1's
I want a solid discount for one without a psu. BTW this also would allow them to say the gear does not work and needs psu repairs to work thus allowing them to legally use a lower value to ship to the EU.
So bitmain I know you would be stuck a shit load of psu's if you do this, but the truth is for many of us we just do not need the psu!