Power Supply efficiency Tags: Power Supplies Heat Systems Last response: March 27, 2013 12:48 AM in Systems Share Frizzo March 26, 2013 9:37:52 PM 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? More about : power supply efficiency Outlander_04 a b ) Power supply March 26, 2013 10:13:50 PM 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 Frizzo March 27, 2013 12:48:37 AM is what this guy saying in the first few paragraphs accurate? http://mindyourdecisions.com/blog/2011/03/31/is-an-ener... Can't find your answer ? Ask ! Publish Related resources: ForumSolved750W+ Power supply with good efficiency at low load ForumPower Supply Efficiency Myths ForumHigh efficiency power supply low wattage system ForumPower Supply Efficiency ForumLow power, high efficiency power supply needed ForumHigh Efficiency 500-550W Power Supply ForumMultiple high efficiency Pico power supplies? ForumSolvedNeed An efficient Power supply for my components ForumSolvedBuilding the most power efficient computer at 850 watt supply ForumWould this Power Supply power my PC efficiently? ForumSolvedIs my power supply good enough for an energy efficient 9800 gt ForumRecommend me a Reliable, Affordable, and Efficient Power Supply for my ForumPower supply efficient for 460 gtx ForumSolvedBest efficient 500-600watt Power supplies for the best value ForumSolvedNeed help understanding Volts vs Watts re: OC power efficiency ForumSolvedPower Efficiency & EMI: Low EMI, DIGI+ VRM, Digital Power Design Forum[Power Supplies] Can it run this efficiently? ForumUsing Silverstone ST50EF: Should I upgrade for better power efficiency? ForumGood, Efficient 1000w Power Supplies.... ForumPower Efficiency Diagnostics Report, need help More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !