Can this power supply handle dual 8800 GTX?

H

Hanzu

New Member
well, its kind of too late, i already have the power supply, im not sure if its the power supply or not, but everytime i run 3dmark in sli mode, the things shuts my computer off instantly after the first test. but when i turn off sli mode, it runs just fine.

here is the power supply i have

http://www.newegg.com/Product/Product.asp?Item=N82E16817341003

please let me know, i was told it should, but do you its a problem related other then just the power supply?


THanks
 
Yeah I think your PSU isnt up for the job, on BFG website they recommend a PSU with 450W 30A on a +12v rail (single card).

Your PSU only has 20A, so im guessing thats your problem.
 
They recommend, but it should work. I don't quite know how affective the Amps can affect a GPU's performance, but to my book, it should be alright. If not, then wait a bit more for two 8600 series.
 
ghostfacesuk said:
Yeah I think your PSU isnt up for the job, on BFG website they recommend a PSU with 450W 30A on a +12v rail (single card).

Your PSU only has 20A, so im guessing thats your problem.
Click to expand...

yeah

with out sli, 3dmark runs fine, compelete test
but when i turn the sli on.
boom, system shuts off in the middle of that test.. actually. after test 1, when the screen switches, the whole thing just shuts off
 
woah waoh woah

the combined amperage on the 12v rail is more than up to the task. That PSU should easily handle it, and i have seen it do so in many magazines.

the OCZ GameXStream 850w should easily handle it
 
The recommendation is for the total +12V amperage not the amperage available on any single +12V rail. That PSU is more than capable of handling the load, although it is, of course, possible that you simply have a defective unit.

I take it that you've used adapters to form two more PCI-E connectors, so that you have 2 PCI-E connectors in each card? Are you having problems in games (i.e. not just 3D Mark)?

EDIT: You don't have a large drive array or anything like that that's not mentioned in your sig do you?
 
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ceewi1 said:
The recommendation is for the total +12V amperage not the amperage available on any single +12V rail. That PSU is more than capable of handling the load, although it is, of course, possible that you simply have a defective unit.

I take it that you've used adapters to form two more PCI-E connectors, so that you have 2 PCI-E connectors in each card? Are you having problems in games (i.e. not just 3D Mark)?

EDIT: You don't have a large drive array or anything like that that's not mentioned in your sig do you?
Click to expand...

hmm
i have 2 connectors coming out of each card....? there was suppose to be just one coming out of each card? i sthat what your saying?
 
Hanzu said:
hmm
i have 2 connectors coming out of each card....? there was suppose to be just one coming out of each card? i sthat what your saying?
Click to expand...

Are you using adapters that have the 6 pin PCI-E on one end and two 4 pin molex connectors on the other end? If you are, then you should be using the two PCI-E connectors coming DIRECTLY from the power supply.
 
MatrixEVO said:
Are you using adapters that have the 6 pin PCI-E on one end and two 4 pin molex connectors on the other end? If you are, then you should be using the two PCI-E connectors coming DIRECTLY from the power supply.
Click to expand...

I just realized that your cards require 2 PCI-E connectors each, which totals to 4 of them. Your power supply has only 2. I'm not 100% sure if it's better to use individual PCI-E connectors, but if it is, then you should have gotten a PSU with 4 connectors:

CLICK









_______________
 
Hanzu said:
hmm
i have 2 connectors coming out of each card....? there was suppose to be just one coming out of each card? i sthat what your saying?
Click to expand...
You should have two connectors coming out of each card - use the two native PCI-E cables and two molex to PCI-E adapters to get the 4 PCI-E required. If you'd only plugged in one, the GPUs would be receiving insufficient power.

I just realized that your cards require 2 PCI-E connectors each, which totals to 4 of them. Your power supply has only 2. I'm not 100% sure if it's better to use individual PCI-E connectors, but if it is, then you should have gotten a PSU with 4 connectors:
Click to expand...
I would have preferred to see 4 native connectors, but what he has should work without issues.
 
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I don't see that you need SLI with 8800GTX's, but that PSU should handle it. If it doesn't then that thing is way overated. I would assume since it has 4
12V Rails with 20A on them. And 850W is almost twice required. Does anyone know how much power a 10K HD pulls? You do have a lot of fans in that
Fatal1tly case, right? You may call me an idiot for saying this but, maybe Vista has something to do with this, Vista screws everything over.
 
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