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1000W Galaxy + G80 SLI, enough? - Page 3

post #21 of 37
I don't think those specs have been published yet... they're guidelines for PSU manufacturers.

It seems that the reaction leans toward dedicated PSUs that fit in 5.25" bays. We'll see.
    
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post #22 of 37
I just did the calculations on it and with 17A per 12V rail, each rail can supply a maximum of 204W, which wont be even close to enough for a card that draws 250-300W. Youll need 2 separate 12V rails just to run one card.
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post #23 of 37
Thread Starter 
The cards have 2 PCI-E slots each, you need 4 connectors for SLI.

So from what you said that would be enough? O.o
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post #24 of 37
NOT be enough

check my calculations earlier. The high-end PSUs often have dedicated rail(s) for the video. The PC Power & Cooling 1KW Unit, for example, has one rail for the GPUs of 36A. This is not enouigh, since you likely need 42A.

My recommendation, again, the PC Power & Cooling 750W with one 12V rail of 60A. This unit will power the entire rig, including one DX10 card. (it might even do dual cards, but then no room left whatsoever). Then, add a dedicated front-bay unit, like the 300W FSP I linked earlier, for the second DX10 card.

That should work just fine in my opinion.
    
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post #25 of 37
Quote:
Originally Posted by Murlocke
The cards have 2 PCI-E slots each, you need 4 connectors for SLI.

So from what you said that would be enough? O.o

It's about rails. It's got NOTHING to do with power connectors...

Plus, when was the last time you had 4 connectors? There's gonna be adapters involved.

Usually all the 6 pin pci-e plugs are on teh same rail...
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post #26 of 37
Quote:
Originally Posted by Murlocke
The cards have 2 PCI-E slots each, you need 4 connectors for SLI.

So from what you said that would be enough? O.o
Basically youll need either four 12V rails just to run to cards in SLI, or a PSU with a single HUGE 12V dedicated just to graphics (which would have to be around 50A).

Man, this is gonna get nasty for Europeans since they cant have any PSU rail over 20A.
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post #27 of 37
Quote:
Originally Posted by HrnyGoat
Man, this is gonna get nasty for Europeans since they cant have any PSU rail over 20A.
Is that true? Oh man!
    
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post #28 of 37
Thread Starter 
The galaxy has 4 actual PCi-E connectors, sideburns.

No adapters.
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post #29 of 37
Quote:
Originally Posted by Murlocke
The galaxy has 4 actual PCi-E connectors, sideburns.

No adapters.
It could have six, but that doesn't mean that it could power six cards.
    
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post #30 of 37
Quote:
Originally Posted by Snerp
Is that true? Oh man!
Yeah, some stupid group of bureaucrats in the EU decided that no PSU rail can exceed 240VA, so thats means a single 12V rail cannot be more than 20A. That means youd need a PSU with 6 or 7 12V rails just to properly power a high-end SLI G80 system.
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