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Power supplies

Last response: in Systems
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March 22, 2010 8:16:42 AM

Hello,
If i buy an 850 watt power supply, but i dont use all of the 850 watts, do i still have to pay for all the 850 watts?

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March 22, 2010 8:38:22 AM

No. You pay for the wattage amount that your system uses. A 850W PSU doesn't uses constantly 850W. Be sure though that the 850W PSU will support your system hardware.
a c 144 ) Power supply
March 22, 2010 8:38:41 AM

If you are asking, "Will the PSU still pull 850 watts from the wall?"
No.

Basically, a PSU will pull what it needs - up to it's rated output - from the wall. If your system only needs 400 watts, it will pull about 500 watts (400 watts + plus losses due to efficiency) from the wall.
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March 22, 2010 8:43:33 AM

so with an 80+ psu, it would pull 120 watts per 100 needed?
March 22, 2010 8:48:40 AM

Something like that! :D 
!