Before overloading a power supply we always test to see if over current protection (OCP) is active and at what current level it is triggered. To test this we installed only the main motherboard connector and the EPS12V connector to the load tester +12V1 input, since these two connectors were installed on the power supply +12V1 rail. OCP entered in action when we tried pulling 33 A or more from the power supply +12V1 rail.

Then starting from test five we increased currents to the maximum we could with the power supply still running inside ATX specs. The results are below. If we tried to increase one amp more on any output ripple would  jump to the roof, showing that we had already reach the maximum this unit could deliver.

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 and when we tried to pull far more than it could deliver it would shut down, so this unit passed on this test.

As you can see Enermax could have labeled this unit as a 750 W product, but they decided not to do so probably because of efficiency, which drops below 80% if we pull more than 620 W from it.