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Originally Posted by bitTRL1000
I actually use that exact load tester at work. However that is meant to test battery output power and charging system voltage. It is not meant to load test a charging system or AC to DC converter, which is what a PC PS is. I said that I am not aware of a load tester meant SPECIFICALLY for a computer PS, that is available to the end-consumer. I wouldn't be surprised if one was though.
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maybe I can help you understand this :
the lable on the side of the power supply is what it is rated at.
for example the 12 volt 20 rating means that the 12 volt portion of the power supply can deliver up to 20 amps and still be withen the rated voltage, if more amps were drawn from the 12 volt supply the voltage would drop below the rated output and will then be what is called overloaded. but it will still work up to a point set in the design of the power supply to shut it down.
the amps that are actually drawn from the supply will depend on the loads applied to it, the rateings are what the design of the voltage regulators are set for.
it is the same for all the other voltages that the power supply has for its output.