Power Supply efficiency

if you have a 500w psu that is rated 80% efficient. if the 12v needs to draw 100w, that means it needs to pull 120 or 125? to actually get 100w , because of heat dissipation?
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More about power supply efficiency
  1. There is no standard way that maufacturers rate their psu's

    But reputable brands are rating the output amperages , and that with a little bit of math tells you the wattage

    Draw from the wall would be higher due to heat losses
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