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Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the 750 GQ'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	18.8mV	12.3mV	20.1mV	10.9mV	Pass
20% Load	29.6mV	19.5mV	26.4mV	12.0mV	Pass
30% Load	70.0mV	40.2mV	45.2mV	13.9mV	Pass
40% Load	45.6mV	28.2mV	33.4mV	14.5mV	Pass
50% Load	39.5mV	29.6mV	37.3mV	14.6mV	Pass
60% Load	42.4mV	33.4mV	39.5mV	17.5mV	Pass
70% Load	44.6mV	33.2mV	40.9mV	17.8mV	Pass
80% Load	48.2mV	37.3mV	44.2mV	20.3mV	Pass
90% Load	50.1mV	38.5mV	48.8mV	20.4mV	Pass
100% Load	55.2mV	45.8mV	52.2mV	20.9mV	Fail
110% Load	62.5mV	53.8mV	63.3mV	26.8mV	Fail
Cross-Load 1	28.8mV	20.9mV	25.8mV	16.7mV	Pass
Cross-Load 2	52.9mV	45.0mV	54.5mV	22.7mV	Fail

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Besides lousy performance in the transient response tests, the ACRF topology is prone to high ripple as well. The ripple performance of this unit is a big step backwards for EVGA-branded PSUs in this wattage category. On top of that, the 750 GQ fails to keep the 3.3V rail in spec during the full load and CL2 tests. In addition, the 5V rail has high ripple, leading to a failure during the overload test. To be fair, this pushes the PSU beyond its limits, so we aren't going to deduct any performance points. The +12V ripple performance is much better, but we would like to see below 40mV of ripple on this rail.

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 0.01V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.