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. OCP entered in action when we tried pulling more than 36 A from the +12 V 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.

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 Corsair could have labeled this unit as a 450 W product, but they decided not to do so probably because of efficiency, which drops below 80% if we pull more than 400 W from it.