Before overloading power supplies we always test first if the over current protection (OCP) circuit is active and at what level it is configured.

In order to do that we configured the +5 V and +3.3 V rails with just 1 A and increased current on the single +12 V rail up to the maximum our load tester can pull (66 A), but the power supply didn’t shut down. This means that either OCP is not present or configured at a value above 66 A.

Then starting from test five we increased currents to the maximum we could with the power supply still running. If we increased one amp on any output the power supply would immediately shut down. In fact after running on the below configuration for about 45 seconds the unit would shut down, showing that its over power protection was active. Nice.