EVGA SuperNOVA 750 GT Power Supply Review

The EVGA 750 GT is a good PSU, which would be more attractive at a lower price.

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Advanced Transient Response Tests

For details about our transient response testing, please click here.

In the real world, power supplies are always working with loads that change. It's of immense importance, then, for the PSU to keep its rails within the ATX specification's defined ranges. The smaller the deviations, the more stable your PC will be with less stress applied to its components. 

We should note that the ATX spec requires capacitive loading during the transient rests, but in our methodology, we also choose to apply a worst case scenario with no additional capacitance on the rails. 

Advanced Transient Response at 20% – 20ms

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Advanced Transient Response at 20% – 10ms

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Advanced Transient Response at 20% – 1ms

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Advanced Transient Response at 50% – 20ms

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Advanced Transient Response at 50% – 10ms

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Advanced Transient Response at 50% – 1ms

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Transient response is good at 12V and 5V, but mediocre at the 3.3V and 5VSB rails.

Turn-On Transient Tests

In the next set of tests, we measure the PSU's response in simpler transient load scenarios—during its power-on phase. Ideally, we don't want to see any voltage overshoots or spikes since those put a lot of stress on the DC-DC converters of installed components.

There is a notable overshoot at 5VSB. The results are much better at 12V, in both tests. 

Power Supply Timing Tests

There are several signals generated by the power supply, which need to be within specified, by the ATX spec, ranges. If they are not, there can be compatibility issues with other system parts, especially mainboards. From year 2020, the PSU's Power-on time (T1) has to be lower than 150ms and the PWR_OK delay (T3) from 100 to 150ms, to be compatible with the Alternative Sleep Mode.

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PSU Timings Table
T1 (Power-on time) & T3 (PWR_OK delay)

The PWR_OK delay is within the 100-150ms region, so the PSU supports the alternative sleep mode recommended by the ATX spec.

Ripple Measurements

Ripple represents the AC fluctuations (periodic) and noise (random) found in the PSU's DC rails. This phenomenon significantly decreases the capacitors' lifespan because it causes them to run hotter. A 10-degree Celsius increase can cut into a cap's useful life by 50%. Ripple also plays an important role in overall system stability, especially when overclocking is involved.

The ripple limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

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10% Load5.1 mV10.3 mV5.4 mV6.8 mVPass
20% Load7.3 mV11.4 mV6.0 mV7.6 mVPass
30% Load9.5 mV11.8 mV7.4 mV8.1 mVPass
40% Load11.0 mV12.3 mV7.4 mV15.0 mVPass
50% Load10.7 mV13.0 mV8.2 mV10.9 mVPass
60% Load12.1 mV13.2 mV8.4 mV11.9 mVPass
70% Load16.8 mV14.7 mV9.9 mV13.4 mVPass
80% Load17.4 mV15.4 mV14.9 mV13.8 mVPass
90% Load16.8 mV16.0 mV13.9 mV13.5 mVPass
100% Load22.7 mV22.2 mV17.4 mV19.0 mVPass
110% Load22.8 mV23.1 mV17.6 mV18.8 mVPass
Crossload 110.7 mV25.9 mV20.8 mV8.1 mVPass
Crossload 222.5 mV17.5 mV11.0 mV14.2 mVPass

Ripple suppression is not the best in this category, but you cannot call it mediocre either. 

Ripple At Full Load

Ripple At 110% Load

Ripple At Cross-Load 1

Ripple At Cross-Load 2

EMC Pre-Compliance Testing – Average & Quasi-Peak EMI Detector Results

Electromagnetic Compatibility (EMC) is the ability of a device to operate properly in its environment without disrupting the proper operation of other nearby devices.

Electromagnetic Interference (EMI) stands for the electromagnetic energy a device emits, and it can cause problems in other nearby devices if too high. For example, it can be the cause of increased static noise in your headphones or/and speakers.

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EMI emissions are low. 

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Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a contributing editor at Tom's Hardware, covering PSUs.

  • hermitboy
    As far as the EVGA SuperNOVA product group goes, it looks like the G5 line is better than this GT line.
    Any idea how either of those compare to the SuperNOVA GA line?
    Or why EVGA has so many different types of SuperNOVA?

    I've seen the GA line in a number of bundles lately (with GPUs), but haven't found any reviews outside of the basic ones from shopping sites or comments on Reddit/other forums. So it is nice to see so many PSU reviews here that go into so much detail.