Why you can trust Tom's Hardware Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.
Efficiency, Temperature, And Noise
Our efficiency testing procedure is detailed here.
Using results from the previous page, we plotted a chart showing the 1000 G3's efficiency at low loads, and loads from 10 to 110 percent of its maximum-rated capacity.
EVGA's SuperNOVA 1000 G3 is highly efficient; it comes close to the Platinum-rated FSP and Rosewill units with similar capacity. Under light loads, this platform's efficiency levels look amazing.
Efficiency At Low Loads
In the following tests, we measure the 1000 G3's efficiency at loads significantly lower than 10 percent of its maximum capacity (the lowest load the 80 PLUS standard measures). The loads we dialed were 20, 40, 60, and 80W. This is important for representing when a PC is idle, with power-saving features turned on.
|Test #||12V||5V||3.3V||5VSB||DC/AC (Watts)||Efficiency||Fan Speed||Fan Noise||PF/AC Volts|
|1||1.198A||0.489A||0.481A||0.197A||19.653||73.258%||0 RPM||0 dB(A)||0.745|
|2||2.421A||0.988A||0.996A||0.391A||39.745||82.438%||0 RPM||0 dB(A)||0.866|
|3||3.648A||1.485A||1.510A||5.073A||59.903||83.524%||0 RPM||0 dB(A)||0.924|
|4||4.854A||1.994A||1.989A||0.785A||79.767||85.020%||1728 RPM||45.7 dB(A)||0.945|
We measure very high efficiency levels under light loads and observe passive operation up to the third test. The only downside is that the fan starts at a very high speed during the last test, which we think is unnecessary given an 80W load.
The ATX specification states that 5VSB standby supply efficiency should be as high as possible, recommending 50 percent or higher efficiency with 100mA of load, 60 percent or higher with 250mA of load, and 70 percent or higher with 1A or more of load.
We take four measurements: one each at 100, 250, and 1000mA, and one with the full load the 5VSB rail can handle.
|Test #||5VSB||DC/AC (Watts)||Efficiency||PF/AC Volts|
The 5VSB regulation circuit needs a redesign to enable higher efficiency. It is a shame to see the 1000 G3's 5VSB rail demonstrate mediocre performance when the PSU fares so well in the other disciplines we've looked at so far.
Power Consumption In Idle And Standby
In the table below, you'll find the power consumption and voltage values of all rails (except -12V) when the PSU is idle (powered on, but without any load on its rails), and the power consumption when the PSU is in standby mode (without any load, at 5VSB).
Standby power consumption is very high for a modern PSU, especially with 230V where our meter shows 0.228426W. Demonstrating such high power consumption, the 1000 G3 doesn't meet the ATX spec's demands for less than 0.5W with 0.225W load at 5VSB.
Fan RPM, Delta Temperature, And Output Noise
Our mixed noise testing is described in detail here.
The first chart below illustrates the cooling fan's speed (in RPM), and the delta between input and output temperature. The results were obtained at 36°C (96.8°F) to 49°C (120.2°F) ambient temperature.
The next chart shows the cooling fan's speed (again, in RPM) and output noise. We measured acoustics from one meter away, inside a small, custom-made anechoic chamber with internals completely covered in sound-proofing material (be quiet! Noise Absorber kit). Background noise inside the chamber was below 18 dB(A) during testing, and the results were obtained with the PSU operating at 36°C (96.8°F) to 49°C (120.2°F) ambient temperature.
The following graph illustrates the fan's output noise over the PSU's operating range. The same conditions of the above graph apply to our measurements, though the ambient temperature was between at 30°C (86°F) to 32°C (89.6°F).
The fan profile is very aggressive when it doesn't need to be, given this platform's high efficiency.
Current page: Efficiency, Temperature, And NoisePrev Page Load Regulation, Hold-Up Time, And Inrush Current Next Page Protection Features, Evaluated
Stay on the Cutting Edge
Join the experts who read Tom's Hardware for the inside track on enthusiast PC tech news — and have for over 25 years. We'll send breaking news and in-depth reviews of CPUs, GPUs, AI, maker hardware and more straight to your inbox.
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.
Orange Pi teams up with Huawei to create a SBC for AI development — Huawei Ascend chip delivers 8/20 TOPS of AI performance
Modder creates an awesome modular kinetic PC case — 3D-printed gears, wood, and acrylic combine to generate mesmerizing continual movements
AMD makes CPU and GPU comeback in latest Steam Hardware Survey — Red Team regains lost ground from Nvidia and Intel
140$. Exactly the same cost with Corsair's RMx1000 current pricing. Not sure which unit i would choose between those 2.Reply
>>>The 1000 G3's single bulk cap is provided by Chemi-Con (400V, 820uF, 2000h @ 105°C, CE)
Strangely, but I did not find "CE" series of capacitors in the Nippon Chemi-Con catalog
Wow. The price point of this and overall performance makes this a serious player even for those who were in the market for nothing more than 850W gold or even platinum PSUs. So many people out there say "you don't need more than a xxxW power supply for your build." I like to buy based on <60% of calculated max load use of my build for less fan noise, heat output, and higher efficiency wall draw.Reply
Buying a gold 600W PSU when my rig uses 500W for example does not make much sense to me. I'd prefer to spend a little more and buy a gold 850W ($110USD vs. $130USD in the example of these two 650 & 850 G3 series on NewEgg right now). Not only for a higher efficiency operation as described above, but for future headroom growth. But I understand many do not think that and look to save a few dollars everywhere...one being on the PSU.
19478429 said:140$. Exactly the same cost with Corsair's RMx1000 current pricing. Not sure which unit i would choose between those 2.
Keep in mind when comparing the RM1000x that it was introduced at $180 in November 2015 and it took nearly a year to see the prices drop down below $150. The EVGA was originally released at $170 and has only been out for four months. Also keep in mind that the Corsair is marketed more for silent operation (drawback to that shown below).
If none of the drawbacks described and shown here do not bother you, and if overall "hot" efficiency and exhaust temperature are among top priorities for you, then the EVGA is the better performer. Average efficiency result of 7 load line tests, and the average exhaust temps under each test:
EVGA - 88.571%, 45.0C
Corsair - 87.857%, 49.8C
^^While the <1% efficiency difference is nominal and will not be seen on your monthly power bill, that nearly 5C difference coming out can make a slight difference in the temperature of your room in the summer. So the Corsair being quieter has a drawback.
I would have liked to see the EVGA 1000 G2 in the performance tables as well. Both to see the generational improvement and to make a value comparison while both units are on the market.Reply
Is EVGA stopping production of the G2 series ?
10TACLE, if the efficiency of the EVGA and the Corsair are nearly identical, the ~5 degree C temp difference could be just from the amount of airflow being less in the Corsair. Power consumption is the only thing that equates to BTUs, heat.Reply
19479497 said:10TACLE, if the efficiency of the EVGA and the Corsair are nearly identical, the ~5 degree C temp difference could be just from the amount of airflow being less in the Corsair. Power consumption is the only thing that equates to BTUs, heat.
That's why I stated the downside to the Corsair is the hotter air coming out the back. Same thing with a video card: you have to sacrifice more heat output for a quieter fan speed.
I don't have 115V test results (but only 230V) for the G2s, so I couldn't add them to the graphs.Reply
"We didn't get any OCP results because our unit died during the OPP test, meaning either that this particular sample had a problem or OPP is set very high."Reply
Seems like this would be a big deal ?
Maybe at least one bullet in the Con column.
I have another one here, which come late, to test. If it dies as well then I will update the con list.Reply