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Question About PSUs

Last response: in Components
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December 7, 2012 2:48:11 AM

I was wondering, say you got a 1200W PSU. And lets say that you only use about 550W of that 1200W power supply. Will the PSU use all 1200W per/hour of usage
or will it only use up the 550W that the parts take up.
The reason being is I'm scared of getting larger PSUs because of fear of the jump in electricity bill.

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a b ) Power supply
December 7, 2012 2:56:15 AM

No the PSU will NOT use the full 1200W, only the watts required for the given system...

If it was not like this power saving feutures on CPUs and graphics cards would be totally pointless as you would pull the same power regardless of the power state your PC is in.
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a c 697 ) Power supply
December 7, 2012 2:58:06 AM

No it will not it will only pull from the wall what the system components use divided by the efficiency. So in your case if 80% 550/0.8= 687.5watt
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December 7, 2012 2:59:57 AM

Thanks to both of you. Shame I can only select one best answer.
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December 7, 2012 3:00:06 AM

Best answer selected by h3llfire741.
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a b ) Power supply
December 7, 2012 3:01:00 AM

rolli59 said:
No it will not it will only pull from the wall what the system components use divided by the efficiency. So in your case if 80% 550/0.8= 687.5watt


Cudos to you... Very important efficiency factor...
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