Reviews Power Supplies BitFenix Formula Gold 550W Power Supply Review

BitFenix Formula Gold 550W Power Supply Review

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 BitFenix Formula Gold 550W at 45c. This makes Test #1 equal to 147W by loading the 12v rails to 10a, 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 ~280mV drop on the 12v rail and ~65mV 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 ~60mV drop.

Transient Test 2

Loaded/Unloaded

12v/5v

Test #2 is equal to approximately 50% of the rated capacity of the BitFenix Formula Gold 550W at 45c. This makes Test #2 equal to 275W by loading the 12v rails to 20a, 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 ~220mV 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 ~60mV drop.

Transient Load Testing Summary

The Transient Load Test results for the BitFenix Formula Gold 550W are very good. In today’s testing, the Formula Gold 550W saw the loaded 12v rail post a peak change of ~280mV and the loaded 5v rail post a peak change of ~65mV. The unloaded 5v peak change during the 12v load was ~60mV. Those numbers are, in an absolute sense, excellent on the 12v rail and very good on the 5v rail. This is not only because of the numbers the unit posted but also because of this unit’s small capacity. All in all, this may prove to be the best result of the day for this unit as these numbers would be for most power supplies we have seen. Let’s move on now to see how this unit does in the DC Output Quality aspect of our testing!

 

 

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 Power Supply Editor for one of the truly early, groundbreaking, and INDPENDENT PC enthusiast sites ([H]ardOCP) until its mothballing in April of 2019. Paul now brings the same flair and style of his power supply reviews to TheFPSReview.com.

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