What does the 80 plus mean?

What does a power supply with 80 Plus rating mean? 80 Plus is a certification designed to denote that a power supply is at least 80% efficient at 20%, 50%, and 100% loads. This means a 500W 80 Plus rated PSU would draw a maximum of 625W at 100% load. ... Most power supplies available today are at least 80 Plus rated.

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