So in answer to CYPER's question...hell yes, it was a bad recommendation. I'm glad I got a 1000W which accounted for KnC's screw-up in power estimation. Granted, later firmware has rendered the issue moot..but for the initial release it was a swing-and-a-miss by KnC on that 850W recommendation for sure.
900W AC power is within spec of V850
Even 950W AC will be within spec on 240V
Of CoolerMaster V850, barely @120V....and by virtue of higher efficiency than the corsairs would only show that hypothetical 900W (but still only rated to 840W on +12V) versus a higher value that would be shown by the corsairs at same DC output wattage. But the Jupiter's were pulling 950-ish and more at the wall at release up through .95 firmware being released. And the 240V value would actually go the other way with the higher efficiency gained by the voltage jump...the wall wattage would show lower at 240V versus 120 at same DC output. The Corsair HX850's that some people were buying were definitely out-of-spec at the wattage being pulled during initial product release due to a smaller actual +12V rail wattage than the overall PSU (again 840W) with seemingly no safety margin and slightly lower efficiency (indicating lower quality parts as well as more internal heat generation which can have a cascade effect when pushing the components to absolute limits). Since KnC didn't recommend a specific brand/model...they just said "850"...I have to say that their overall recommendation was faulty and was the cause of several failures.
edited to better show train of logic in statements