Gigabyte AORUS GP-AP850GM PSU Review

Crmaris September 4, 2018 Featured Tech News, Featured Tech Reviews, Power Supplies

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the GP-AP850GM’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	4.9 mV	6.2 mV	13.1 mV	5.2 mV	Pass
20% Load	22.5 mV	7.2 mV	13.2 mV	6.4 mV	Pass
30% Load	7.1 mV	6.1 mV	12.3 mV	4.9 mV	Pass
40% Load	5.6 mV	6.5 mV	11.9 mV	4.9 mV	Pass
50% Load	5.6 mV	7.3 mV	12.3 mV	4.7 mV	Pass
60% Load	6.4 mV	8.9 mV	13.6 mV	6.5 mV	Pass
70% Load	7.0 mV	10.1 mV	14.5 mV	6.7 mV	Pass
80% Load	8.3 mV	10.3 mV	14.2 mV	7.7 mV	Pass
90% Load	7.7 mV	9.1 mV	15.2 mV	6.4 mV	Pass
100% Load	11.3 mV	14.4 mV	18.2 mV	10.3 mV	Pass
110% Load	77.1 mV	28.6 mV	52.9 mV	26.6 mV	Fail
Crossload 1	27.1 mV	16.9 mV	19.3 mV	5.8 mV	Pass
Crossload 2	9.9 mV	11.5 mV	16.1 mV	7.8 mV	Pass

The ripple suppression is great on all rails, as long as you don't exceed the platform's nominal capacity (which normally you should not do in any case). Apparently this platform doesn't provide much of a headroom, so even with 110% of the max-rated-load it starts to behave strange.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.