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Originally Posted by pettefar
Well it's a "switch-mode" PSU which means it rectifies the incoming mains to create about 400V DC and then uses big transistors to turn it back into AC but at a very much higher frequency. A transformer is then used to get the desired output Voltage ie 12V and the normal rectifying, smoothing and regulating takes place. The transformer and later components can be very small as they are much more efficient at higher frequencies. You can design these beasts to draw minimal current with no load but I guess this one isn't. PCs use the same types of PSU. I will see if I can find an alternate 12V PSU for the Snap Server.
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Thanks for the info Nick, knowledge is always appreciated. I looked at your post earlier and you said that it draws 12.7 watts when it is connected to the snap and 7.something watts when the snap is not connected. What is drawing current in the snap when the unit is off? Does the NIC card stay active when the unit is off? I can't imagine that the BIOS draws 5W to keep the clock running. Just curiousity...