Protection Features Evaluation

OCP should be set lower at +12 V since it allows for excess ripple on this rail. This protection should ensure that the rail doesn't go out of spec, among others. There are no performance problems on the minor rails, but their OCP triggering points are too high, and under harsh conditions, users can kill the VRMs. Lastly, OPP is conservatively set, which is fine with me, given the absence of a heatsink for the bridge rectifier in this PSU.

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.



The conducted EMI emissions are low, with both detectors I tried, average and peak.