The ADATA BN-550 is a good mainstream 550 W power supply that will meet the needs of the average user. Efficiency was high, ranging from 83.7% and 86.1% when pulled between 20% and 80% of the labeled wattage (i.e., between 110 W and 440 W), dropping to 81.7% at 550 W. Voltages were always inside the proper range, as were the noise and ripple levels. All this means that this is a safe power supply that won’t fry or overload your components.
