Protection Features Evaluation

With the only exception of the 3.3 V rail, OCP is correctly set in general. The same goes for OPP, which is conservatively set, below 130%. It is nice to see ATX v3.0 PSUs, which can deliver 200% of their max-rated capacity for short periods if required, with adequate operating protection features.

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 lower 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 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 it is too high.



Several spurs go over the limits with the average EMI detector, and I also found three exceeding the limits with the peak EMI detector.