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EVGA SuperNOVA 750W G2L Power Supply Review

Author: Lee Garbutt
Manufacturer: EVGA

DC Load Regulation and AC Ripple

Testing Methodology

Establishing an accurate load is critical to testing and evaluating a PC power supply.  PCPerspective’s power supply test bench can place a precise DC load on the PSU under test.  Each power supply is tested under controlled, demanding conditions up to its maximum rated load (at 40ºC). Our current suite of tests includes:

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•    DC Load Regulation
•    AC Ripple and Noise
•    Efficiency
•    Differential Temperature
•    Noise

The EVGA 750 Supernova G2L power supply was evaluated on both features and performance.  A full range of equipment was used to test the power supply under controlled load conditions.  

•    (2) CSI3710A Programmable DC load (+3.3V and +5V outputs)
•    (4) CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)
•    (2) 200W Precision resistor load bank (+12V5 and +12V6)
•    Switchable precision resistor load bank (-12V and +5VSB)
•    Agilent 34401A digital multimeter (Accuracy ±0.0035% vDC)
•    Extech 380803 Power Analyzer (Accuracy ±0.5% of full scale)
•    DS1M12 "StingRay" digital oscilloscope (20M S/s with 12 Bit ADC)
•    Extech Model 407738 digital sound level meter (Accuracy ±1.5 dB)

The following cables/connectors were used to connect the EVGA 750 G2L PSU to the PCPerspective power supply test equipment.

•    (1) 20+4 pin ATX
•    (2) 8-pin EPS/ATX12V
•    (4) 6-pin PCI-E
•    (2) SATA
•    (2) Molex

DC Output Load Regulation

To simulate demanding and maximum loading conditions, the EVGA 750W G2L power supply was connected to the load testers and supplied with 120 VAC.  In this test we are interested in seeing how well a PSU can maintain the various output voltages while operating under different loads.  

The ATX12V V2.2 tolerance for voltages states how much each output (rail) is allowed to fluctuate and has tighter tolerances now for the +12V outputs.  I have also included a second table of expanded tolerances (±1% to ±6%) for reference.

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The following tables list the DC voltage results for the 750 Supernova G2L PSU while operating on 120 VAC, 60 Hz.

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The 750W Supernova G2L PSU produced excellent voltage regulation on all of the DC outputs. The three main outputs stayed within ±2% of the recommended guidelines; this is a very good start!

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AC Ripple and Noise on the DC Outputs

The amount of AC ripple and noise present on the DC outputs was checked using a digital oscilloscope.  This AC component may be present in the KHz range where most switching power supplies operate or it may be more prevalent at the 60 Hz line frequency.  We adjust the O-scope time base to look for AC ripple at both low and high frequencies.  The ATX12V V2.2 specification for DC output noise/ripple is defined in the ATX12V Power Supply Design Guide.

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Ideally we would like to see no AC ripple (repetitive) or noise (random) on the DC outputs – the cleaner the better!  But in reality there will always be some present.  I measured the amplitude of the AC signal (in millivolts, peak-to-peak) to see how well the power supply complied with the ATX standard.  The following table lists the ripple/noise results during all of the load tests for the main output voltages of interest.

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The 750W G2L power supply really kept the AC ripple and noise under control, all the way up to a full load of 750W. Note that even the +12V output stayed under 10 mV p-p; very good!

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October 24, 2016 | 01:12 PM - Posted by JohnGR

Really nice PSU, as always, from EVGA. Are the LEDs on when the PSU is connected with power, but the system is power down? Those LEDs will be really helpful when trying to connect a power cable but the room lighting doesn't help.

PS. I am reading that some EVGA FTW like going SuperNOVA because of bad PWM cooling.

October 24, 2016 | 09:36 PM - Posted by Anonymous (not verified)

Here's some thermal pads suckaz, fix it yourself, signed EVGA! The FTW line of GPUs should be calld the WTF line. I'd RMA that crap right back to EVGA, let them fix it!

If the user has to apply the pads does it void the warranty?

"EVGA GTX 1070/1080 Overheating Issues - Company Says Thermal Pads A Solution"

https://www.techpowerup.com/227133/evga-gtx-1070-1080-overheating-issues...

October 25, 2016 | 04:50 AM - Posted by JohnGR

Based on an email that a Greek forum member got from EVGA as a reply, they do NOT acknowledge a problem, they insist that the cards DO NOT need those pads. They just give those pads as a free service to their customers. Funny right? Cards don't need pads, but take them and use them.

November 13, 2017 | 03:43 PM - Posted by LabRat (not verified)

Have owned a 1080ftw since release, 0 issues, my pc is on 24/7, and I regularly play games that use 90% of what the card has to give or more. Never seen it above 65c under full load in a mid tower with everything else air cooled.

I know that 1 person's experience is not indicative of the experience those with issues have had... but I'm more inclined to think that EVGA is right, and they may well be having issues but are in the vocal minority. I know 2 other people that bought the same card, from completely separate outlets, and neither of them have had issues either. One has it stuffed in a micro atx case with garbage airflow too...

October 26, 2016 | 11:52 AM - Posted by Lee Garbutt

No, unfortunately the LEDs only come On when the PSU turns on.

October 26, 2016 | 12:10 PM - Posted by JohnGR

Pity. It would have been a useful feature, rarely necessary, but useful.

October 25, 2016 | 12:04 AM - Posted by Fredy (not verified)

You said :
• (1) 20+4 pin ATX
• (1) 8-pin EPS/ATX12V
• (4) 6-pin PCI-E
• (2) SATA
• (2) Molex

At second page there was 2x 8-pin EPS, which one is correct?
Regards

October 26, 2016 | 12:02 PM - Posted by Lee Garbutt

The full specs are given on page two, which list two 8-pin (4+4) ATX/EPS connectors - this is correct.

The table you quoted is a list of the connectors I used for testing (however, it should have shown two 8-pin EPS being used instead of one - fixed). Sorry for the confusion.

October 27, 2016 | 12:24 AM - Posted by Chaython M (not verified)

gold should be made a defualt standard for power supply units, and should be starting at 60$ to save the world energy/environmental crisis

December 21, 2016 | 03:02 PM - Posted by Anonymous (not verified)

that would put a lot of people out of a job fixing PC's for a living. LOL

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