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InWin Shows Off a 2500 W Power Supply, Plus AIO Coolers, Modular Fans and Cases at Computex
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A 20A 120V circuit would not be enough. That's only 2400 watts and you can only use 80% of that continuously. It would need a dedicated 15A 240V circuit.
At best, the power supply will probably only be 90% efficient at full load, so it could draw over 2600 watts from the wall.