Check out our PSUs 101 article to learn more about PSU protection features.
OCP (Cold @ 25°C)
|12V: 79.6A (127.36%), 11.918V 5V: 31.5A (157.5%), 5.009V 3.3V: 31.2A (156%), 3.295V 5VSB: 5.2A (173.33%), 4.946V|
OCP (Hot @ 42°C)
12V: 79.8A (127.68%), 11.923V
OPP (Cold @ 26°C)
OPP (Hot @ 42°C)
✓ (139°C @ 12V Heat Sink)
12V to Earth: ✓
OCP at 12V and OPP are correctly set, but this is not the case for OCP on the minor rails, which is set too high. No modern system requires such strong minor rails. Even if this is the case, so many Amperes at 5V and 3.3V will highly stress the corresponding DC-DC converters, especially under increased operating temperatures. All other protection features are present and operate fine.
DC Power Sequencing
According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V outputs must be equal to or greater than the 3.3V rail at all times. Unfortunately, Intel doesn't mention why it is so important to always keep the 3.3V rail's voltage lower than the levels of the other two outputs.
DC Power Sequencing Scope Shots
No problems here since the 3.3V rail is always lower than the other two.
Cross Load Tests
To generate the following charts, we set our loaders to auto mode through custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V, and 3.3V rails. The deviations in each of the charts below are calculated by taking the nominal values of the rails (12V, 5V, and 3.3V) as point zero. The ambient temperature during testing was between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).
Load Regulation Charts
Load Regulation Graphs
The lower the power supply's ripple, the more stable the system will be and less stress will also be applied to its components.
Ripple Suppression Graphs
We apply a half-load for 10 minutes with the PSU's top cover and cooling fan removed before taking photos with a modified FLIR E4 camera able to deliver an IR resolution of 320x240 (76,800 pixels).
The hottest part is the board hosting the 12V FETs, which gets close to 80 degrees Celsius. Still, this is not a high temperature given the operating conditions and the FETs' high-temperature limits.
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