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 SolvedHow important is the efficiency of a power supply? Forum Solvedi5 gaming rig. Looking for help with power supply, efficiency/dollar value of build, and questions on multimonitor setup Forum Solved750W+ Power supply with good efficiency at low load Forum Power Supply Efficiency Myths Forum High efficiency power supply low wattage system Forum Power Supply Efficiency Forum Low power, high efficiency power supply needed Forum High Efficiency 500-550W Power Supply Forum Multiple high efficiency Pico power supplies? Forum SolvedCheap efficient power supply with low watts Forum SolvedX-Finity Ultra 600 Power Supply actually reliable or efficient or even safe to not damage a mother board? Forum SolvedLooking for an efficient power supply Forum SolvedNeed An efficient Power supply for my components Forum SolvedBuilding the most power efficient computer at 850 watt supply Forum SolvedIs my power supply good enough for an energy efficient 9800 gt Forum Would this Power Supply power my PC efficiently? Forum Recommend me a Reliable, Affordable, and Efficient Power Supply for my Forum Power supply efficient for 460 gtx Forum SolvedBest efficient 500-600watt Power supplies for the best value Forum SolvedNeed help understanding Volts vs Watts re: OC power efficiency Forum More resources Read discussions in other Systems categories Homebuilt New Build Prebuilt Cases Power Supplies RAM CyberPower !