Protection Features Evaluation

The OCP triggering point at +12 V is set lower than 110%, so the OPP shuts the PSU down at less than 1180 W load. Typically, +12V OCP and OPP are set higher, but since this is a strong PSU, I won't consider it a negative. On the contrary, while it still won't be adequate protection for the two EPS connectors mounted on the same cable, +12 V OCP and low OPP are at least set conservatively.

The minor rails should have triggering points below 130% OCP because they are lightly used in modern systems, so there is no point in allowing them to go this high. Finally, overtemperature protection is set as high as it is because of the lack of large heatsinks on the +12 V board.

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 below the other two.

EMC Pre-Compliance Testing - Average and Quasi-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.



There is a lot of EMI noise in the 3017–3428 kHz range, as well as some spurs in the lower and higher frequencies.