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 SilverStone SX700-G at 45c. This makes Test #1 equal to 184W by loading the 12v rail to 13a, 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 ~400mV drop on the 12v rail and ~60mV 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 ~55mV drop.

Transient Test 2

Loaded/Unloaded

12v/5v

Test #2 is equal to approximately 50% of the rated capacity of the SilverStone SX700-G at 45c. This makes Test #2 equal to 325W by loading the 12v rail to 24a, the 5v rail to 3a, the 3.3v rail to 2a, the +5vsb to 2a, and the -12v to 0.3a before the addition of the transient load. The results of Test #2 show a ~330mV drop on the 12v rail and ~60mV 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 ~50mV drop.

Transient Load Testing Summary

The Transient Load Tests results for the SilverStone SX700-G are passing and generally good. In today’s testing, the SX700-G saw the loaded 12v rail post a peak change of ~400mV and the loaded 5v rail post a peak change of ~60mV. The unloaded 5v peak change during the 12v load was ~55mV. Those numbers are, in an absolute sense, good for the 5v rail. The 12v rail results are good in a relative sense when we consider that this unit is an SFX product. However, this unit does trail what we saw from the FSP Dagger 600W even though that unit is 100W smaller in capacity. Let’s move on now to see how this unit does in the DC Output Quality aspect of our testing!