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 PostPost subject: Test Power Supply        Posted: Fri Jul 24, 2009 1:48 am 
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Hello,
Three years ago I baught a dirt cheap atx computer case with a 400watt power supply for ~40 USD. I'm wondering, how can I test the max number of watts the powersupply gives? Is there any way to do it with a volt meter?

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 PostPost subject: Re: Test Power Supply        Posted: Fri Jul 24, 2009 1:52 am 
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If it says 400w then its 400w. It's not the power output you should be concerned about it's the current on each rail, which can differ from model to model. Decent supplies will have high end 12v rails, while low end models will have low 12v rails and higher 5v rails, to keep the claimed wattage "true". It might be 400w, but its not where you need the power. All power supplies will come with a sticker stating what the current on each rail is. Added together it might come to more than 400w but the PSU will only put on 400w total before it will overload and cause instability, voltage sags, cut out or magic smoke.

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 PostPost subject: Re: Test Power Supply        Posted: Fri Jul 24, 2009 4:03 am 
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Okay, well how much should be expected from 12v rails? A model i'm considering getting has 2A-16A-30A for min-normal-max...

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 PostPost subject: Re: Test Power Supply        Posted: Fri Jul 24, 2009 4:18 am 
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Here is a few prime examples of what you're looking for;

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 PostPost subject: Re: Test Power Supply        Posted: Fri Jul 24, 2009 10:25 am 
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A good PSU will have 20-25A on the 12v rails. It all depends what you need it for. For high end graphics cards you will need good 12v rails, otherwise just about any PSU would do the job.

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