It depends on the voltage you are getting.  In the US, it is typically 120 but that can vary from 110-120.

Watts = Amps x Volts

If you are in the US.
650 to 850 Watts 120 Volts = ~5.5 to 7 Amps each Jupiter so 2 per dedicated circuit is a safe bet.

There are tons of waterblocks out there, the universal brackets are trivial to mod with a cheap drill (if for some odd reason the footprint is non-standard -- would be an odd design choice). Edit: I mean CPU waterblocks.

I never had good luck with oil -- heat transfer coefficient is 3 to 4 times worse for oil, it's messy, it wicks, is more viscous (doesn't flow as well) etc., etc.  Oil is also a pain to circulate well in the tank itself, especially around heatsinks designed for forced air, and don't forget that it wicks.  And it wicks.  Drop a wire into the tank, and have a puddle on the floor in the morning.  4realz.  Anything dipped in oil becomes a pain to rework, no matter how much solvent you use (trust me, it will get on the board even if the board itself is not submerged.  And it *does* have a smell.  There's fun stuff i've only read about -- boiling point ~30 - 40 C, but it costs way too much.  Something like that.

thanks for the reassurance!!!

Any news about the ASIC 28nm chip?

If bet 1 btc that not delivery at october
How btc I will win?

There is betting site for this:

http://bitbet.us/bet/472/kncminer-will-deliver-asic-devices-before-october-1st/

But hard to say how much you get by betting 1 btc and winning

 

sorry, but at first the platinum one is few bucks more only paying off itself in no time
next you wasted money, they proposed 850W..you remember their strategy 'margins upon margins upon margins'...so it should be sufficient even for next generation and overclocking (if possible).

For the same money I'd have preferred the corsair's digital platinum PSU with 7years warranty and 92% efficiency in worst case
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139041

How do we know KNCminer chips can be overclocked? Did I miss some announcement from them?

+1

when i get a tracking number, then ill head down to the computer store. lol

although i got to ask why a cooler master and not a corsair

Platinum doesn't mean 92% efficiency "in worst case".  More like 89% to 92% depending on load on 120V.  On edit:  240V is generally 2% to 3% higher efficiency which is what btc_uzr was referring to. 

Still a very good PSU.  

http://www.plugloadsolutions.com/psu_reports/CORSAIR_75-001305_860W_ECOS%203323_Report.pdf

One thing to watch out for is that KNC for some reason decided to use 4 PCIe connectors instead of EPS12V connector + 3 PCIe connectors.  On the 860 Corsair 2 of the PCIe connectors are on the same PSU connector (i.e. single set of wires with 1 PSU connector on one end and 2x PCIe connector on other end).  Without testing it there is no way to know for sure what the overcurrent limit is for that connector (good PSU limit both overall current and current per wire).  The PCIe standard only mandates that two 8 pin connector supply 300W (1.25@ @ 12VDC).  Now the PSU probably can supply a lot more than that but just by looking at it there is no way to know for sure.  Most reviews only show total load not max load per connector and certainly not at amperages beyond what a PC would use anyways.  

To clarify imagine a Jupiter uses 790W that works out to 16.4A per connector however with this PSU two connectors are on the same set of wires meaning 32.9A.  If the PSU has the overcurrent set to say 40A per connector (connector on PSU) then it would work fine.  However lets say it is only 30A.  Despite the PSU having enough total power its current protection system would cause it to trip because too much if being pulled from one wire.   This could have been avoided if KNC had used EPS12V connector plus PCIE connectors instead.