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post #21 of 35
There is a reason that PC Power & Cooling redesigned their 1KW unit to have only one rail. The older version had two rails, 16A for CPU1, 16A for CPU2 and 36A for video and all else. That 36A would NOT be enough for two G80's. From what's going on in the rumor mill, the R600 will be at least as power demanding as the G88, if not more. But , that's just rumors.

Also, the Enermax Galaxy 1KW unit has the same issue with distribution alone the rails, and there is 41A for the video and all else distributed over 3 12V rails (plus two more 12V rails for the CPU1 and CPU2). Again, 41A is likely not enough for two DX10 cars, plus hard disks, DVD, etc.
    
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post #22 of 35
http://www.zippy.com/P_product_detai...1EPSL-6850P(G1)
http://www.zippy.com/P_product_detai...code=SSL-9800P
http://www.zippy.com/P_product_detai...code=SSL-9850P

They're all single rail PSU but even with the multi-rail Silverstone, it should most definitely be enough
    
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post #23 of 35
Quote:
Originally Posted by Chozart
There is a reason that PC Power & Cooling redesigned their 1KW unit to have only one rail. The older version had two rails, 16A for CPU1, 16A for CPU2 and 36A for video and all else. That 36A would NOT be enough for two G80's. From what's going on in the rumor mill, the R600 will be at least as power demanding as the G88, if not more. But , that's just rumors.

Also, the Enermax Galaxy 1KW unit has the same issue with distribution alone the rails, and there is 41A for the video and all else distributed over 3 12V rails (plus two more 12V rails for the CPU1 and CPU2). Again, 41A is likely not enough for two DX10 cars, plus hard disks, DVD, etc.
If a PSU was made with Four rails, two with 16A each and two with 32A each would that work? or can they not do that?
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post #24 of 35
cgrade: yep, but that's a very powerful PSU

to boredom: the second and third ones have four rails. Also, all are rated at 60A, which I don't think will be enough. The estimate is that the cards will draw around 250W each (maybe even more), which equals 21A per card. For one card, yes, 60A is enough. however, two cards draw 42A max (and that's stock not overclocked), leaving only 18A for everything else, which is preciously little in my opinion. Yeah, probably ok at everything stock but overclockign will be touch.

the Silverstone has the problem that one card will overload the individual rail it is hooked up to.
    
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post #25 of 35
hmm... powerful, but necessary for the future. i think we will soon move to MATX. MacroATX. With larger PSUs, and bigger cards, more drives, etc. we need a standard instead of funky, expensive cubes.
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post #26 of 35
Quote:
Originally Posted by Chozart
cgrade: yep, but that's a very powerful PSU

to boredom: the second and third ones have four rails. Also, all are rated at 60A, which I don't think will be enough. The estimate is that the cards will draw around 250W each (maybe even more), which equals 21A per card. For one card, yes, 60A is enough. however, two cards draw 42A max (and that's stock not overclocked), leaving only 18A for everything else, which is preciously little in my opinion. Yeah, probably ok at everything stock but overclockign will be touch.

the Silverstone has the problem that one card will overload the individual rail it is hooked up to.
Did you factor in the 75w coming from the PCIe slot? If we go with 250w under load needed for the 8800gtx then you should be able to get away with 15a from the PCIe connectors.

The Silverstone I posted should be enough if you adjust the connectors around

EDIT: I just noticed my post didn't make any sense and couldn't even be considered a response to what I quoted...
    
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post #27 of 35
YEah.. I would like to see extended ATX (which already exists for servers) to be used for enthusiast boards also. Right now, with three PCI-E slots on several boards, space gets cramped, and few boards have useful PCI slots.
    
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post #28 of 35
Nvidia recommended a 450w for single 8800gtx and a 850w PSU for it in SLI, given the numbers I think it's safe to say the 8800gtx won't take 250w under load
    
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post #29 of 35
Quote:
Originally Posted by boredom
Nvidia recommended a 450w for single 8800gtx and a 850w PSU for it in SLI, given the numbers I think it's safe to say the 8800gtx won't take 250w under load
and here are the BF2 system requirements:
1.5 GHz processor
512MB RAM
Shader version 1.4 capable graphics card (ATI 9500 and above or nVidia 5200 and above).

go ahead and try to play on a system like that.
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post #30 of 35
Ok.. I think I give you the benefit of the doubt. Personally, I'd prefer a single rail PSU for these beasts ... and I do believe that this is the exact reason PC Power & Cooling redesigned theirs.
    
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