Protection Features Evaluation

This sample has a slightly higher OCP at +12 V, as well as higher OPP triggering points than those I found in testing a while ago elsewhere. Although I am not a fan of high OCP/OPP triggering points, especially with high-capacity PSUs, having slightly more room would have been nice, especially under increased operating temperatures, where OCP at +12 V triggered at 105%.

Contrary to the +12 V rail, OCP triggering points are set high on the minor rails for no reason. There aren't any ripple or load-regulation issues, but I would still like to see tighter protection features on these rails. Finally, OTP is set pretty low, but I didn't encounter any OTP-related issues throughout testing.

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.


As you can see in the graph above, the unit's EMI filter does a good job.