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Old 05-25-2013
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Default Intel's Haswell testing methodology

So I've seen a lot of companies posting that their group regulated PSUs are "Haswell ready". Sure.. anything is Haswell ready if you disable C7 sleep state in the BIOS, but that doesn't meet Intel's definition of Haswell ready, so it's sort of misleading.

If any of you reviewers with load testers want to duplicate Intel's testing for Haswell:

Put 0.1A on +12V1.
Put 0.05A on +12V2.
If the PSU has a single +12V rail, 0.15A load on the +12V does the same thing.
Put the maximum load on the +3.3V and +5V.
The way I calculate this is to take the maximum and divide by 4.15 and then divide by 2.
For example: Max combined for +3.3V and +5V is 150W. (150/4.15)/2=18A per rail.

A pass is when all voltages are within 5%. Typically, the PSU, if group regulated, will go beyond 12.6V.

I've found that even if the load on the non-primary rails is a more realistic lower load, like 5A per rail, the PSU's voltages will be in spec, but if the load suddenly changes, like a drop in the +3.3V and +5V or a sudden rise in the +12V, the PSU may shut off. This emulates going into or coming out of sleep state.

Good luck!
Rest in peace Mike Clements, aka "Yellowbeard"

Rest in peace Joerg Theissen, aka "GI Joe"
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