XFX 650 W XXX Edition Power Supply Review

Overload Tests

First we lowered current at +5 V and +3.3 V to 1 A each and maxed out the +12 V inputs from our load tester (33 A each). At 66 A the power supply didn’t shut down, meaning that either this unit doesn’t have over current protection (OCP) – which is more probable – or that it is configured at a value above that.

Then we tried to find the maximum values this unit could work with its outputs still inside specs, which came to 30 A on each +12 V input (i.e., 60 A total), with the power supply delivering around 745 W. The problem was that under this configuration the unit burned after one minute. Upon opening the unit and testing the main components, we discovered that one of the +12 V rectifiers was burned.