Before overloading a power supply we always like to see at what level its over current protection (OCP) circuit is configured. For this test we set +5 V and +3.3 V inputs from our load tester to pull only 1 A each and maxed out the two +12 V inputs for a total of 66 A. The power supply didn’t shut down, meaning that OCP is not present or is configured at a value above that. The manufacturer does not list OCP as a feature, so the first option seems to be the correct one.

Then we started increasing current on all outputs until we reached the maximum the unit could deliver. You can see the maximum we could pull from this unit below. If we increased one amp from any output ripple and noise would go through the roof, showing that the unit stopped working correctly.

The idea behind of overload tests is to see if the power supply will burn/explode and see if the protections from the power supply are working correctly. This power supply didn’t burn or explode. Even under this overloading efficiency was still very good.