silentpcreview test this power supply it show:
Output 240VAC Input 120VAC Input
Power Efficiency Power Efficiency
ac dc dc
250W 280W 89.3% 289W 86.5%
300W 340W 88.2% 350W 85.7%
500W 585W 85.5% 612W 81.7%
so what will happen now? you will test this power supply and...
because ac voltage and current are not in phase as dc current, the ac power is voltage * current* cos (A), a is the angle between voltage and current, if we set a=45 degree c, then current is about 6.3 A. and that is base on full load condition. most pc draw less than 250Watt, so your situation...