Efficiency, Differential Temperature and Noise
Efficiency
Efficiency is defined by the power output divided by the power input and is usually expressed as a percentage. If a PSU were a 100% efficient (which none are) 750 watts of AC power going in would result in 750 watts of DC power coming out (with no waste heat to dissipate). In the real world there are always inefficiencies and power is lost in the form of heat during the conversion process. Newer revisions to the ATX12V Power Supply Design Guide V 2.2 have continued to increase the efficiency recommendations for PC switching mode power supplies and now lists both required and recommended minimum efficiencies.
We measured the AC power input to the Supernova 750W G2L PSU with an Extech power analyzer while the total DC load was found by adding all the individual +3.3V, +5V, +12V, -12V and +5VSB loads together.
The overall efficiency of the EVGA 750W Supernova G2L power supply is also very good and meets the criteria for 80 Plus Gold certification while operating on 120VAC and elevated temperatures.
80 Plus Program
Note: Tests conducted at room temperature (25°C)
Differential Temperature and Noise Levels
To simulate a demanding environment, some of the warm exhaust air from the PSU under test is recirculated back to the intake through a passive air duct, which allows the PSU air inlet temperature to increase with load, up to 40°C.
The differential temperature across the power supply was calculated by subtracting the internal case air temperature (T in) from the temperature of the warm exhaust air flowing out the back of the power supply (T out).
Thermocouples were placed at the air inlet and exhaust outlet. The ambient room air temperature was 23ºC (74ºF) +/- 0.5ºC during testing.
T out = temperature of air exhausting from power supply
T in = temperature of air entering power supply
Delta T = T out – T in
Sound pressure level readings were taken 3’ away from the rear of the case in an otherwise quiet room. The ambient noise level was ~28 dBA.
Note: The EVGA 750 G2L power supply was tested with the ECO Thermal Control System switched On (enabling fan-less operation).
* Fan not spinning
With the ECO Thermal Control System engaged the PSU was silent through the 50% load tests. Once the cooling fan started to spin up at the 75% load mark, the noise was still relatively quiet. At full load with an elevated ambient temperature, the G2L PSU cooling fan noise became noticeable but not really loud.
(Courtesy of EVGA)
Really nice PSU, as always,
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.
Here’s some thermal pads
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-company-says-thermal-pads-a-solution
Based on an email that a
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.
Have owned a 1080ftw since
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…
No, unfortunately the LEDs
No, unfortunately the LEDs only come On when the PSU turns on.
Pity. It would have been a
Pity. It would have been a useful feature, rarely necessary, but useful.
You said :
• (1) 20+4 pin
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
The full specs are given on
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.
gold should be made a defualt
gold should be made a defualt standard for power supply units, and should be starting at 60$ to save the world energy/environmental crisis
that would put a lot of
that would put a lot of people out of a job fixing PC’s for a living. LOL