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 put +5 V and +3.3 V outputs to pull only 1 A and increased current on the power supply +12 V rail until it shut down. This happened when we tried to pull more than 34 A from this 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. After working around two minutes on the configuration listed below, the over power protection entered in action, shutting down the power supply. Nice.