Result Summary

The power supply had no issues delivering its full power (and another 10% on top of that) at >40 °C ambient temperature with no deviations from the ATX specification.

Up to a third of its rated power the PSU fan stays off and only begins to show intermittent operation in the 40% test. While the silent profile for up to 40-50% of the load is quite common, the tuning profile is a little interesting. As the fan begins to spin, it ramps up very rapidly to over 1600 RPM. While at this load it cannot really be considered very loud, it definitely is a step above from where one typically would like the PSU fan to be at half of its rated load. At over 2000 RPM in the later tests the PSU becomes clearly audible, albeit still far from what a modern top tier GPU would sound like during gaming.



The PSU's efficiency matches the 80 Plus Gold specification in the 230 V power grid with up to 92.2 % peak efficiency. Efficiency even at 5% of the load is above 80%. While the Atmos handled the 110 % test with no issues, the efficiency at this point begins to dip considerably.

Voltage Regulation

The voltage regulation on the +12V rail good, reaching a deviation of 1.5 % only in the overload test. The minor rails observe slightly more deviation both at the lower end and especially at the higher end as we approach their rated combined power limit.

Ripple

Ideally you want the DC voltage delivered by your power supply to be a completely flat line when looking through an oscilloscope. However due to the switching nature of the ATX power supply and the less than ideal real world behavior of all the components involved, we get very small fluctuations in the voltage that are ripple and noise. The ATX spec allows a ripple of up to 120 mV for the +12 V rail and 50 mV for the minor rails.


Overall the ripple is very well controlled on the +12 V and +5 V rails. The +3.3 V stands out as slightly noisier, although it is still well within the ATX spec.

No unusual patterns were observed during the testing. Below you can find the image of ripple at 110% of the PSU load.

Short Circuit Protection

Short circuit protection is one of the most fundamental and important protections for a power supply. If a short circuit is detected on any rails, the PSU should turn off and prevent damage to itself and other components.


SCP was working as expected with the unit.