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 GIGABYTE P650B at 45c. This makes Test #1 equal to 173W by loading the 12v rail to 12a, 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 ~380mV drop on the 12v rail and ~45mV 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 ~45mV drop.

Transient Test 2

Loaded/Unloaded

12v/5v

Test #2 is equal to approximately 50% of the rated capacity of the GIGABYTE P650B at 45c. This makes Test #2 equal to 326W 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 ~370mV 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 GIGABYTE P650B are passing and generally decent for what this unit is today. In today’s testing, the P650B saw the loaded 12v rail post a peak change of ~380mV and the loaded 5v rail post a peak change of ~60mV. The unloaded 5v peak change during the 12v load was ~50mV. Those numbers are, in an absolute sense, passing. In a relative sense, this unit is mixed with the Seasonic FOCUS GM-650 (the only other 650W unit we have reviewed to date) so that is good. That said, this unit is also one of GIGABYTES mainstream offerings so these results seem to be in line with its position in the product stack. Let’s move on now to see how this unit does in the DC Output Quality aspect of our testing!

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Paul Johnson

Paul is a long time PC hobbyist and tech enthusiast having gotten his start when he broke his first C64 quickly followed by breaking his first IBM XT. Most notably however, for 12 years, he served as the...

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