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 increased current on +12V2 expecting to see the power supply shutting down. We went all the way up to 33 A (the maximum our load tester can deliver) and the power supply didn’t shut down, showing that either OCP is disabled or configured at a value above 33 A.

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 the power supply would shut down, showing that one of the protections entered in action.

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 Antec could have labeled this unit as a 900 W product, but they decided not to do so because of efficiency, which dropped below 80% during our overloading.