The Cost of Running Your PC 
Posted November 16th, 2008
This article goes into more detail than most people will find necessary, myself included. However, I was surprised to see that the actual power efficiencies of the three test systems were over 80% at both idle and peak load. I was expecting at least one end of the spectrum to have poor efficiency.
Ultimately, though, if you want to save energy costs, turn off your devices! If your devices are plugged into a surge protector, then pull it out of the wall socket after you’ve powered everything down. I plugged my surge protector into a Kill A Watt and was shocked to see how much energy was still being drawn by my ostensibly off computers and peripherals.
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