DC Output Quality

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 examination of the DC Output Quality.

Control Test Graphing

EVGA SuperNOVA 750 G5 750W Power Supply dc output quality graph

This image is the blank background control test on an unused connector from our SM-8800 during the testing of the EVGA SuperNOVA 750 G5. This lets us determine what the background noise looks like during testing.

120v Input

100v Input

Test #1 is equal to approximately 25% of the rated capacity of the SuperNOVA 750 G5 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. The SuperNOVA 750 G5 is starting off in excellent shape. The 12v and 3.3v rails are peaking at ~10mV of ripple/noise and the 3.3v rail is peaking at less than ~10mV of ripple/noise.

120v Input

100v Input

Test #2 is equal to approximately 50% of the rated capacity of the SuperNOVA 750 G5 at 45c. This makes Test #2 equal to 366W by loading the 12v rail to 27a, the 5v rail to 7a, the 3.3v rail to 5a, the +5vsb to 2a, and the -12v to 0.3a. Test #2 sees only minor changes as the 12v rail is coming in at ~20mV of ripple/noise, the 5v rail is coming in at ~15mV of ripple/noise, and the 3.3v rail is peaking at ~10mV of ripple/noise.

120v Input

100v Input

Test #3 is equal to approximately 75% of the rated capacity of SuperNOVA 750 G5 at 45c. This makes Test #3 equal to 572W by loading the 12v rail to 42a, the 5v rail to 7a, the 3.3v rail to 5a, the +5vsb to 2a, and the -12v to 0.3a. Test #3 sees the 12v rail peaking at ~20mV of ripple/noise while the minor rails are coming in at ~15mV of ripple/noise.

120v Input

100v Input

Test #4 is equal to approximately 100% of the rated capacity of the SuperNOVA 750 G5 at 45c. This makes Test #4 equal to 751W by loading the 12v rail to 60a, the 5v rail to 2a, the 3.3v rail to 1a, the +5vsb to 2a, and the -12v to 0.3a. In the final regular test, we see the 12v rail peaking at ~20mV of ripple/noise while the 5v rail is peaking at ~10mV of ripple/noise and the 3.3v rail is peaking at ~15mV of ripple/noise.

Torture Test

The Torture Test is equal to approximately 80% of the rated capacity of the SuperNOVA 750 G5 at 45C full load. This makes the Torture Test equal to 600W by loading the 12v rail to 44a, the 5v rail to 8a, the 3.3v rail to 5a, the +5vsb to 6a, and the -12v to 0.3a. At the end of the Torture Test, we see the 12v rail peaking at ~25mV of ripple/noise while the 3.3v rail is peaking at ~20mV of ripple/noise and the 5v rail is peaking at ~10mV of ripple/noise.

DC Output Quality Summary

The overall DC Output Quality of the EVGA SuperNOVA 750 G5 is very good. The SuperNOVA 750 G5 ended up posting a peak trace amplitude on the 12v rail of ~25mV followed by ~20mV on the 3.3v rail and ~15mV on the 5v rail during our normal tests. The worst relative value among these was below ~50% of the ATX12v specification limit. However, during our Torture Test, we saw some random spikes in ripple/noise values on the 3.3v rail that did not occur in other tests. That said, it seems that this unit has very nice results during our regular load overall. Now, on a relative note, this unit posted better result than what we saw on the recent Phanteks AMP 750 which is also very good to see. Let’s move on now and see how all of this wraps up!

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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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