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EVGA GQ Series 750W PSU Review

EVGA teamed up with FSP once again to produce the new GQ line, which is one step below the highly popular G2 series. The four GQ PSUs feature 80 Plus Gold efficiency and semi-modular cabling, promising quiet operation.

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).

Test12V5V3.3V5VSBPass/Fail
10% Load18.8mV12.3mV20.1mV10.9mVPass
20% Load29.6mV19.5mV26.4mV12.0mVPass
30% Load70.0mV40.2mV45.2mV13.9mVPass
40% Load45.6mV28.2mV33.4mV14.5mVPass
50% Load39.5mV29.6mV37.3mV14.6mVPass
60% Load42.4mV33.4mV39.5mV17.5mVPass
70% Load44.6mV33.2mV40.9mV17.8mVPass
80% Load48.2mV37.3mV44.2mV20.3mVPass
90% Load50.1mV38.5mV48.8mV20.4mVPass
100% Load55.2mV45.8mV52.2mV20.9mVFail
110% Load62.5mV53.8mV63.3mV26.8mVFail
Cross-Load 128.8mV20.9mV25.8mV16.7mVPass
Cross-Load 252.9mV45.0mV54.5mV22.7mVFail
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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.

Ripple At Full Load

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.