PSU Category means the best airflow efficiency. The airflow is batter from non-modular to semi-modular to modular.
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Maximum Power
Maximum Power
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Fan Size
Fan Size
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Efficiency
Efficiency
Power supply efficiency is the amount of the actual power delivered to the components divided by the electrical power drawn from the main supply socket. If a PSU has 85% efficiency that means the 85% of the total power can be used and the rest 15% will be lost.
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Efficiency Rating
Efficiency Rating
The 80 PLUS program tests computer power supplies for efficiency at 20%, 50%, and 100% loads.