ATX Power Supply Wattage

Hello everyone. I have a ATX power supply that says it can give out 500 Watts Max. But how can i be sure that this is true. Is there a mechanism to test it ?
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More about power supply wattage
  1. Here are a few good places to start for your review for your help:

    I would recommend providing the make & model of your PSU and we could better assist you.
  2. Pretty much, no. To really test a PSU takes some fairly exotic test equipment.

    Brand and model can be a good indicator. Strangely enough, its weight in comparison with similarly rated power supplies is a good indication. The better PSU will be heavier.
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