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
This image is the blank background control test on an unused connector from our SM-8800 during the testing of the Phanteks AMP 750. 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 Phanteks AMP 750 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 Phanteks AMP 750 is starting off in decent shape. The 12v rail is peaking at ~30mV of ripple/noise and the minor rails are 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 Phanteks AMP 750 at 45c. This makes Test #2 equal to 343W by loading the 12v rail to 21a, the 5v rail to 4a, the 3.3v rail to 2a, the +5vsb to 2a, and the -12v to 0.3a. Test #2 sees only minor changes as the 12v rail is coming in at ~30mV of ripple/noise, the 5v rail is coming in at ~10mV of ripple/noise, and the 3.3v rail is peaking at less than ~10mV of ripple/noise.
120v Input
100v Input
Test #3 is equal to approximately 75% of the rated capacity of Phanteks AMP 750 at 45c. This makes Test #3 equal to 574W 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 ~35mV of ripple/noise while the minor rails are coming in at ~10mV of ripple/noise.
120v Input
100v Input
Test #4 is equal to approximately 100% of the rated capacity of the Phanteks AMP 750 at 45c. This makes Test #4 equal to 756W 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 ~30mV of ripple/noise while the minor rails are peaking at ~15mV of ripple/noise on the 3.3v rail and 5v rail.
Torture Test
The Torture Test is equal to approximately 80% of the rated capacity of the Phanteks AMP 750 at 45C. This makes the Torture Test equal 607W 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 ~60mV of ripple/noise while the 3.3v rail is peaking at ~30mV of ripple/noise and the 5v rail is peaking at ~20mV of ripple/noise.
DC Output Quality Summary
The overall DC Output Quality of the Phanteks AMP 750 is good. The AMP 750 ended up posting a peak trace amplitude on the 12v rail of ~35mV followed by ~15mV on the 3.3v rail and ~15mV on the 5v rail during our normal tests. The worst relative value among these hit well below ~50% of the ATX12v specification limit. However, during our Torture Test, we saw some random spikes in ripple/noise values the longer the unit ran those spikes pushed the values in this test up to ~60mV on the 12v rail, ~30mV on the 5v rail, and ~20mV on the 3.3v rail. This is a bit unusual, but it was repeatable. So, it seems that while this unit has very nice results during our regular load tests the longer test was harder on it in this regard. Let’s move on now and see how all of this wraps up!