Protection Features Evaluation

Although the second 12 V rail is weaker on paper, real-world application shows that it has the same OCP setting as 12V1, which is the right thing to do given the connectors it supports.

OPP is properly set, while the minor rails have sky-high triggering points. Finally, all other protection features are present and work well.

DC Power Sequencing

According to Intel's most recent Power Supply Design Guide (revision 1.4), the +12 V and +5 V rails must have voltages equal to or greater than the +3.3 V rail's output at all times. For our first measurement, we turn the unit off and switch it back on without a load on any of the rails.



The 3.3 V rail is always at a lower voltage than the other two rails.

EMC Pre-Compliance Testing - Average and Peak EMI Detector Results

Electromagnetic Compatibility (EMC) is the ability of a device to operate properly in its environment without disrupting the proper operation of other close-by devices.

Electromagnetic Interference (EMI) stands for the electromagnetic energy a device emits, and it can cause problems in other close-by devices if too high.


Some spurs exceed the limit with both detectors. That said, Quasi-Peak EMI detector readings are unlikely not to be on point.