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Nov 7, 2019 at 18:46 comment added Romen "Basically the different ratings show different levels of reliability towards being able to constantly supply 500w for instance." The 80 Plus rating is just about efficiency. A 500W PSU that is 100% efficient uses 500W from the wall. 500W at 80% would mean 625W pulled from the wall. Obviously the higher rated PSUs have higher quality components, but even a low efficiency PSU should be able to supply the advertised wattage constantly.
Jun 10, 2019 at 12:08 history answered Henk Blaauw CC BY-SA 4.0