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Psu Watts Question


skoty
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I have a 550w PSU do you think it will run the system specs below?

 

Intel i7-930 2.8ghz

24gigs DDR3

2 1tb HDDs (internal)

1 1tb HDD (external)

NVidia GTX 560 ti

 

as of right now my current system specs are what follows

 

Intel i7-930 2.8ghz

24gigs DDR3

2 1tb HDDs (internal)

1 1tb HDD (external)

ATI Radeon 6670 HD

 

 

if I could I would like to SLI two 560 ti on the 550w psu but not sure I can nor do I want to burn anything out. BTW All these parts where given to me (except the 6670 HD) and the previous owner had a 750w hooked to it

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Depends on the power supply itself, but typically SLI/Crossfire can add about 100+W ( depending on video card you're planning)

 

For example's sake, you're thinking of adding a 560 TI to another 560TI.

A decent 550/500Watt PSU can handle a single 560TI.

 

Add another one, you could be look at ~650W.

 

Either way, buying a 'cheap' (in the sense of cost and parts) 650W might get you by but in the long run, it may cause some problems with your GFX cards.

You will also want to check how many amps each rail pushes out.

 

For instance, the 560TI needs about 14Amps of power for its connections.

So as in example, having a

+12V1 18A

+12V2 18A

Would be alright assuming you hooked up each of the +12V rails to each of the video cards. (assuming SLI)

 

in the single card instance:

a single +12V1-18A connector would be enough.

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139051

The outputs are:

+3.3V@25A, +5V@25A, +12V@62A, [email protected], +5VSB@3A

Meaning you have a single rail of 62A, which is fine in your case even if you choose to SLI. You'd consume 28A of power running into SLI but keep in mind other things get hooked up to it so if you have too much hooked up to that rail... it could cause some issues.

 

This one also has a 25A rail, so it should cover most of the smaller bases (such as your mobo and HDDs).

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