It is important to understand what efficiency is and what the ratings actually mean. The efficiency rating indicates how much energy is retained or lost during the transfer from the wall to your components. It does not indicate the overall quality of the power supply. A power supply does not need an 80 PLUS Gold rating to be safe and reliable. And a power supply with an 80 PLUS Gold rating is not necessarily any of those things. The MWE Bronze V2 guarantees a standard efficiency of 85%, while being safe and reliable.
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