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Active PFC Power Supplies

What's the maximum efficiency of a 550 watt PSU with active PFC?
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  1. This is the one I'm using.
  2. Best answer
    Efficiency relates to input power versus output power. This is what the 80Plus standard is designed to value and represent.
    Different power supplies will have widely varying efficiencies, and even those that meet an 80Plus standard will still vary to some degree at different load levels.
    The basic 80Plus rating means that at 20%, 50% and 100% load, the PSU achieves an efficiency of at least 80%. The subsequent Bronze, Silver, Gold....etc represent increases in this value.
  3. Best answer selected by smokeybravo.
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