Cooler Master eXtreme Power Plus 500 W Power Supply Review

Load Tests (Cont’d)

We always try to pull more power from the units we review. But in order to consider an overload successful, the outputs must be with noise and ripple within the range declared on ATX specs. Since this power supply was already with noise and ripple outside specs during normal range of operation, we decided to not overload it.

We, however, tested its the over current protection (OCP) circuit, to see if it is active and at what level it is config
ured.

In order to do that we configured +12V1 with a very low current (1 A) and increased current on +12V2 until we couldn’t turn on the power supply. This happened when we tried to pull more than 24 A from it. So the OCP circuit is configured at 24 A, while the label says each rail can deliver up to 18 A. OCP configuration could be tighter, but we’ve seen lots of power supplies with OCP configured with values way above that.