Well I think the 285 classified and 4-way SLI is aimed primarily at benchmark fanatics, so they probably expect you to be using this on a test bench and probably have multiple psu's. I'd be very surprised if a single unit has 12 6-pin connectors.
For that setup you are going to need something that can output close to 1200 watts. Actual power use under load should be around 1,000 watts provided you keep the system simple. To give you an idea, my machine can pull about 850-900 watts using 3 Geforce GTX 280 OC cards and an overclocked Core i7 920 @ 4.0GHz. I've only got a couple of SSDs and one optical drive. So there isn't a crazy amount of storage devices in my machine or anything. I've also got watercooling added to the mix so that uses a few watts too. Still, I'm going to guess that something like that would probably be able to draw close to 200 watts more than my machine does.
I have the classified with 3 gtx 285, core i7 920 OC to 3.6, 1 SSD and 2 HD on air. It pulls somthing like 750-800 watts according to my ups when I run crysis warhead.
Don't get me wrong, I really like my setup, but I got mine before the 5870 and 5970 came out. I am not sure it makes sense to build a 4 way nvidia sli system right now. You may be better off building an interim system with the E760 3 way SLI and either two 5870s or a single 5970. Their value should be good for resale if fermi turns out to be anything great and you would save tons of money, not only on the motherboard and videocards, but also on the power supply.
Well my question was really geared towards "what power supply could possibly have that many PCI-E connectors" I figured that wattage would require something over 1KW, perhaps around 1.2KW but the connectors are just ridiculous and I can't see using 4 pin molex to 6 pin pci-e's as an effective and clean way to do it.
As crazy as it sounds there is a psu that could do it. Strider ST1500 it is a 1500 watt psu, but since being more efficient only hurts your wallet and clearly anyone spending 1700 for hardware that is about to be outdated can afford it. Just buy extra pcie cables and plug the six pin into the eight pin spots. The hard part is figuring out which is the ground wires so that your card will draw power. On a six pin there are two grounds and four power lines on a eight pin they add two more power lines.
Couldn't you get a modular PSU and order separate PCIE connectors from the OEM? OR I'm sure you could just have a PSU made with the correct amount of connectors. I once saw a build with a PCP&C PSu with 29 - yes TWENTY-NINE SATA power cables so I am relatively certain it can be done with a single, extremely powerful PSU. Not that it would be cheap by any stretch of the word but that wasn't the question.
Edit - as a matter of fact, I KNOW you can order separate cables from Corsair. All you would need to do is email them requesting X number of PCIE connectors for the HX1000 and you're done.
Not February but in March we are going to have Fermi GF100 which will be way faster then the gtx295/285. Also Intel's new Gulftown 6 core cpu but it will be an extreme part so you are looking around a grand. Also evga is release dual CPU socket board as well. Where you people been, in the caves? CES 2010 tells it all.