EVGA SuperNOVA 1000 G7 Power Supply Review

The EVGA SuperNOVA 1000 G7 is tiny in dimensions but is powerful, offering top performance.

EVGA SuperNOVA 1000 G7
(Image: © Tom's Hardware)

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Primary Rails And 5VSB Load Regulation

The following charts show the main rails' voltage values recorded between a range of 40W up to the PSU's maximum specified load, along with the deviation (in percent). Tight regulation is an important consideration every time we review a power supply because it facilitates constant voltage levels despite varying loads. Tight load regulation also, among other factors, improves the system’s stability, especially under overclocked conditions and, at the same time, it applies less stress to the DC-DC converters that many system components utilize.

Load regulation is tight enough on all rails. 

Hold-Up Time

Put simply; hold-up time is the amount of time that the system can continue to run without shutting down or rebooting during a power interruption.

The hold-up time is long and the power ok signal is accurate. 

Inrush Current

Inrush current, or switch-on surge, refers to the maximum, instantaneous input current drawn by an electrical device when it is first turned on. A large enough inrush current can cause circuit breakers and fuses to trip. It can also damage switches, relays, and bridge rectifiers. As a result, the lower the inrush current of a PSU right as it is turned on, the better.

Inrush current is high with both voltage inputs that we tried. 

Leakage Current

In layman's terms, leakage current is the unwanted transfer of energy from one circuit to another. In power supplies, it is the current flowing from the primary side to the ground or the chassis, which in the majority of cases is connected to the ground. For measuring leakage current, we use a GW Instek GPT-9904 electrical safety tester instrument.

The leakage current test is conducted at 110% of the DUT's rated voltage input (so for a 230-240V device, we should conduct the test with 253-264V input). The maximum acceptable limit of a leakage current is 3.5 mA and it is defined by the IEC-60950-1 regulation, ensuring that the current is low and will not harm any person coming in contact with the power supply's chassis.

EVGA 1000 G7

(Image credit: Tom's Hardware)

Leakage current is low. 

10-110% Load Tests

These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures. They also show how the fan speed profile behaves under increased operating temperatures.

Swipe to scroll horizontally
Test12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)PSU Noise (dB[A])Temps (In/Out)PF/AC Volts
10%6.374A1.936A1.958A0.98A99.98788.011%0<6.044.64°C0.971
Row 2 - Cell 0 12.298V5.165V3.371V5.103V113.606Row 2 - Cell 6 Row 2 - Cell 7 Row 2 - Cell 8 40.33°C115.14V
20%13.754A2.907A2.939A1.178A199.92691.314%0<6.045.75°C0.991
Row 4 - Cell 0 12.290V5.16V3.368V5.094V218.946Row 4 - Cell 6 Row 4 - Cell 7 Row 4 - Cell 8 40.95°C115.11V
30%21.487A3.394A3.43A1.377A299.96592.273%0<6.046.35°C0.994
Row 6 - Cell 0 12.282V5.157V3.367V5.085V325.085Row 6 - Cell 6 Row 6 - Cell 7 Row 6 - Cell 8 41.23°C115.08V
40%29.184A3.88A3.922A1.576A399.49292.427%0<6.047.75°C0.995
Row 8 - Cell 0 12.277V5.154V3.366V5.075V432.222Row 8 - Cell 6 Row 8 - Cell 7 Row 8 - Cell 8 42.12°C115.05V
50%36.559A4.853A4.903A1.777A499.22792.164%0<6.049.13°C0.995
Row 10 - Cell 0 12.274V5.152V3.365V5.066V541.676Row 10 - Cell 6 Row 10 - Cell 7 Row 10 - Cell 8 43.02°C115.02V
60%44.092A5.831A5.895A1.982A599.75991.601%123630.243.16°C0.996
Row 12 - Cell 0 12.246V5.146V3.359V5.045V654.748Row 12 - Cell 6 Row 12 - Cell 7 Row 12 - Cell 8 49.87°C114.98V
70%51.496A6.808A6.882A2.184A699.46591.089%140534.743.43°C0.995
Row 14 - Cell 0 12.241V5.142V3.357V5.034V767.891Row 14 - Cell 6 Row 14 - Cell 7 Row 14 - Cell 8 50.58°C114.95V
80%59.004A7.787A7.868A2.288A799.48890.442%171739.843.73°C0.995
Row 16 - Cell 0 12.229V5.138V3.354V5.024V883.981Row 16 - Cell 6 Row 16 - Cell 7 Row 16 - Cell 8 51.78°C114.91V
90%66.840A8.276A8.351A2.392A899.24389.713%204044.744.56°C0.994
Row 18 - Cell 0 12.221V5.134V3.352V5.014V1002.344Row 18 - Cell 6 Row 18 - Cell 7 Row 18 - Cell 8 53.66°C114.87V
100%74.494A8.769A8.864A3.005A999.21288.953%234347.546.24°C0.994
Row 20 - Cell 0 12.210V5.131V3.35V4.99V1123.303Row 20 - Cell 6 Row 20 - Cell 7 Row 20 - Cell 8 56.37°C114.84V
110%82.078A9.752A9.946A3.009A1099.85687.97%268350.846.55°C0.994
Row 22 - Cell 0 12.203V5.127V3.347V4.983V1250.246Row 22 - Cell 6 Row 22 - Cell 7 Row 22 - Cell 8 57.43°C114.8V
CL10.112A14.013A14.163A0A121.27885.802%0<6.047.97°C0.98
Row 24 - Cell 0 12.308V5.152V3.367V5.119V141.341Row 24 - Cell 6 Row 24 - Cell 7 Row 24 - Cell 8 42.83°C115.13V
CL20.112A23.299A0A0A121.38184.245%0<6.049.51°C0.981
Row 26 - Cell 0 12.308V5.151V3.368V5.124V144.075Row 26 - Cell 6 Row 26 - Cell 7 Row 26 - Cell 8 43.12°C115.13V
CL30.112A0A23.45A0A80.5779.28%0<6.051.83°C0.967
Row 28 - Cell 0 12.299V5.164V3.377V5.114V101.638Row 28 - Cell 6 Row 28 - Cell 7 Row 28 - Cell 8 44.64°C115.14V
CL481.835A0A0A0A999.84689.444%227747.545.19°C0.994
Row 30 - Cell 0 12.218V5.144V3.358V5.073V1117.842Row 30 - Cell 6 Row 30 - Cell 7 Row 30 - Cell 8 55.16°C114.85V

The PSU doesn't have a problem operating under high temperatures for prolonged periods, but you should expect high noise output. 

20-80W Load Tests

In the following tests, we measure the PSU's efficiency at loads significantly lower than 10% of its maximum capacity (the lowest load the 80 PLUS standard measures). This is important for representing when a PC is idle with power-saving features turned on.

Swipe to scroll horizontally
Test12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)PSU Noise (dB[A])Temps (In/Out)PF/AC Volts
20W1.207A0.484A0.489A0.195A19.9969.134%0<6.040.23°C0.788
Row 2 - Cell 0 12.299V5.168V3.372V5.123V28.913Row 2 - Cell 6 Row 2 - Cell 7 Row 2 - Cell 8 37.15°C115.17V
40W2.657A0.677A0.685A0.293A39.9980.216%0<6.041.24°C0.9
Row 4 - Cell 0 12.299V5.167V3.372V5.12V49.851Row 4 - Cell 6 Row 4 - Cell 7 Row 4 - Cell 8 37.87°C115.16V
60W4.108A0.871A0.881A0.391A59.98984.662%0<6.041.61°C0.941
Row 6 - Cell 0 12.298V5.167V3.372V5.117V70.856Row 6 - Cell 6 Row 6 - Cell 7 Row 6 - Cell 8 37.86°C115.15V
80W5.554A1.064A1.076A0.489A79.93586.967%0<6.043.76°C0.96
Row 8 - Cell 0 12.298V5.166V3.372V5.114V91.915Row 8 - Cell 6 Row 8 - Cell 7 Row 8 - Cell 8 39.79°C115.15V

The unit achieves high efficiency under light loads, with minimal noise output because the fan doesn't spin. 

2% or 10W Load Test

From July 2020, the ATX spec requires 70% and higher efficiency with 115V input. The applied load is only 10W for PSUs with 500W and lower capacities, while for stronger units, we dial 2% of their max-rated capacity.

Swipe to scroll horizontally
12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)PSU Noise (dB[A])Temps (In/Out)PF/AC Volts
1.472A0.255A0.255A0.053A20.54570.164%0<6.035.04°C0.792
Row 2 - Cell 0 12.298V5.167V3.371V5.128V29.282Row 2 - Cell 6 Row 2 - Cell 7 23.65°C115.16V

The PSU achieves over 70% efficiency with a 2% load, as the ATX spec recommends. 

Efficiency & Power Factor

Next, we plotted a chart showing the PSU's efficiency at low loads and loads from 10 to 110% of its maximum rated capacity. The higher a PSU’s efficiency, the less energy goes wasted, leading to a reduced carbon footprint and lower electricity bills. The same goes for Power Factor.

This is a highly efficient platform. There is room for improvement, though, at super-light loads. 

5VSB Efficiency

Swipe to scroll horizontally
Test #5VSBDC/AC (Watts)EfficiencyPF/AC Volts
10.1A0.512W76.602%0.064
Row 2 - Cell 0 5.124V0.668WRow 2 - Cell 3 115.16V
20.25A1.28W80.835%0.142
Row 4 - Cell 0 5.123V1.584WRow 4 - Cell 3 115.16V
30.55A2.813W81.626%0.26
Row 6 - Cell 0 5.115V3.446WRow 6 - Cell 3 115.16V
41A5.107W79.616%0.357
Row 8 - Cell 0 5.107V6.415WRow 8 - Cell 3 115.16V
51.5A7.644W79.448%0.412
Row 10 - Cell 0 5.096V9.622WRow 10 - Cell 3 115.16V
62.999A15.16W78.969%0.477
Row 12 - Cell 0 5.055V19.198WRow 12 - Cell 3 115.16V

The 5VSB rail is efficient. 

Power Consumption In Idle And Standby

Swipe to scroll horizontally
Mode12V5V3.3V5VSBWattsPF/AC Volts
Idle12.278V5.162V3.363V5.122V7.9550.42
Row 2 - Cell 0 Row 2 - Cell 1 Row 2 - Cell 2 Row 2 - Cell 3 Row 2 - Cell 4 Row 2 - Cell 5 115.16V
StandbyRow 3 - Cell 1 Row 3 - Cell 2 Row 3 - Cell 3 Row 3 - Cell 4 0.0580.006
Row 4 - Cell 0 Row 4 - Cell 1 Row 4 - Cell 2 Row 4 - Cell 3 Row 4 - Cell 4 Row 4 - Cell 5 115.16V

We would like to see below 0.1W vampire power with 230V input. 

Fan RPM, Delta Temperature, And Output Noise

All results are obtained between an ambient temperature of 37 to 47 degrees Celsius (98.6 to 116.6 degrees Fahrenheit).

(Image credit: Tom's Hardware)

(Image credit: Tom's Hardware)

The fan's speed increases linearly as the load and the operating temperatures increase. Given the small and overpopulated PCB and the high Wattage, this is the best FSP could do, also considering the ten-year warranty. 

The following results were obtained at 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit) ambient temperature.       

(Image credit: Tom's Hardware)

(Image credit: Tom's Hardware)

At normal operating temperatures, close to 30 degrees Celsius, the PSU's passive mode lasts for long, and the load on the minor rails doesn't seem to affect it. The 30 dBA mark is passed with 700 W and, with above 850 W, noise exceeds 40 dBA. 

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Contributing Editor

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

  • Co BIY
    Another great review.

    Are there cost reductions in making a physically smaller power supply ?

    I hope we get to see a review of the Chieftronic Powerplay. It's putting up some interesting numbers.
    Reply