Transient Testing

For those of you that are curious as to some of the reasoning and equipment behind our PSU testing program here at TheFPSReview, we have put together an introduction for you that shares a lot of the behind the scenes of the program. This program is based on what the author developed at [H]ardOCP and utilizes the equipment bequeathed to the author by Kyle Bennett. The testing we are conducting today is exactly as described in that document and will continue with our Transient Testing.

Transient Test 1

Loaded/Unloaded

12v/5v

Test #1 is equal to approximately 25% of the rated capacity of the ASUS ROG THOR 850W at 45c. This makes Test #1 equal to 222W by loading the 12v rail to 16a, the 5v rail to 2a, the 3.3v rail to 1a, the +5vsb to 2a, and the -12v to 0.3a before the addition of the transient load. The results of Test #1 show a ~180mV drop on the 12v rail and ~40mV drop on the 5v rail when each is directly loaded. At the same time that the load was being triggered on the 12v rail, the 5v rail measured a ~40mV drop.

Transient Test 2

Loaded/Unloaded

12v/5v

Test #2 is equal to approximately 50% of the rated capacity of the ASUS ROG THOR 850W at 45c. This makes Test #2 equal to 433W by loading the 12v rail to 32a, the 5v rail to 4a, the 3.3v rail to 3a, the +5vsb to 2a, and the -12v to 0.3a before the addition of the transient load. The results of Test #2 show a ~200mV drop on the 12v rail and ~50mV drop on the 5v rail when each is directly loaded. At the same time that the load was being triggered on the 12v rail, the 5v rail measured a ~40mV drop.

Transient Load Testing Summary

The Transient Load Tests results for the ASUS ROG THOR 850W are excellent. In today’s testing, the ROG THOR 850W saw the loaded 12v rail post a peak change of ~200mV and the loaded 5v rail post a peak change of ~50mV. The unloaded 5v peak change during the 12v load was ~40mV. Those numbers are, in an absolute sense, excellent and mixed to almost better than what we saw from the excellent Enermax REVOLUTION DF 850W. With another excellent set of results under our belts, let’s move on now to see how this unit does in the DC Output Quality aspect of our testing!