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Old 10-13-2009, 02:49 PM   #1 (permalink)
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Default What does a 650w PSU draw when idle?

Just a typical power question:

If your computer has a 650w PSU, is it drawing 650w constantly from the wall outlet and just supplies wattage from that 650 pool to the components when needed?

OR

If your computer has a 650w PSU, is it only drawing from the wall outlet what the current components require? Meaning if your current components require 400w, is it drawing 400w with the PSU having a capability of 650w? Or is it constant @ 650w?
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Old 10-13-2009, 02:59 PM   #2 (permalink)
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Default Re: What does a 650w PSU draw when idle?

I believe it always draws the 650watts (or near that). Reason being is you can test any one of the connectors on a PSU when the PSU is turned on and you can measure the voltage being used (done all the time when testing the 12 volt connector when a PSU is the suspect for a computer not working).

That is my thought at least, i don't know for sure. But it seems to me when the PSU is on, it is drawing how much power it is rated for. Again i just come to that conclusion because you can test any of the connectors and you get a reading.
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Old 10-13-2009, 03:04 PM   #3 (permalink)
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Default Re: What does a 650w PSU draw when idle?

The second one. Case in point a friend of mine bought a 1000W corsair PSU for his dual CPU machine and when he measured what it was drawing from the wall? 250W.
Lex what you were measuring there is the volts - these are supposed to be as rated at all times the difference comes from the amps that are drawn which are variable.
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Old 10-13-2009, 03:38 PM   #4 (permalink)
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Default Re: What does a 650w PSU draw when idle?

Well there you go. Thanks for the info!
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Old 10-13-2009, 03:39 PM   #5 (permalink)
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Default Re: What does a 650w PSU draw when idle?

It will draw the amount that is needed by your computer, plus its inefficiency.

If your PSU is 85% efficient at 100W, then it will draw 115W from your socket. Sometimes you can find the efficiency specifications online.
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