Protection Features Evaluation

There is a small difference between OCP triggering points with hot and cold measurements, which shows that the corresponding circuits are implemented well. That said, OCP is set quite high on all rails, especially the minor ones, where there is no point for such high power levels.

In the OPP evaluation, I wasn't able to push the PSU any harder than during normal testing, where the PSU refused to operate normally and kept shutting down with a load of 110%.

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. We turn the unit off for our first measurement 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 Quasi-Peak EMI Detector Results

Electromagnetic Compatibility (EMC) is the ability of a device to operate correctly 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.



There are some high EMI spikes, with the more severe one close to 1 MHz.