EVGA Supernova 650 G3 Power Supply Review

EVGA in all probability isn’t the primary identify you consider relating to high-quality PSUs, however they’re definitely no newbies contemplating they made what’s principally the Tesla Roadster of PSUs – top-flight specs that nearly everybody needs, but in addition large overkill and past price range for many PC builders. Right now, in distinction, we’ll be reviewing an EVGA Supernova 650 G3 PSU, one which the typical PC builder can truly afford, but is sufficient for even a reasonably high-end PC. Will EVGA be capable of ship on a finances?



Specs and Options

It makes use of a HDB variable velocity fan for very quiet operation and excessive reliability. It additionally boasts rather a lot about low ripple and excellent voltage regulation, which we’ll take an in depth take a look at later. It’s a single rail PSU like virtually all trendy PSUs available on the market (multi-rail PSUs have gotten much less widespread and true multi-rail PSUs virtually remarkable) that claims to be Haswell prepared and SLI/Crossfire prepared. The Haswell prepared is nearly a given because it makes use of a DC/DC converter design which suggests the 12V output just about by no means will get a load sufficiently small for it to function in a area of poor transient efficiency. The SLI prepared is usually advertising because the offered cables will solely accommodate at most three GPUs that every solely has one energy connector whereas most mid to high-end GPUs have no less than 2 energy connectors, however it might technically work for a video modifying machine that favors a number of decrease finish GPUs over a single excessive finish one. The guarantee is a beneficiant 7 years.

Under are the listed specs and extra particulars concerning the energy provide:


Further Options


Packaging and Equipment

We’ll begin by opening the field at which level we discover a bag containing the PSU, one other bag containing the cables, and an set up guide. Included with the cables is an adapter to allow the PSU and not using a motherboard, one thing that may come in useful later.

The cables are as follows, all detachable:
24″ ATX
28″ four/eight pin EPS12V
24″ 6/eight pin GPU
24″ 6/eight pin GPU + 29″ 6/eight pin GPU
2x 20″ SATA + 24″ SATA + 28″ SATA
20″ Molex + 24″ Molex + 28″ Molex + 32″ Molex
four″ Molex to mini four pin

I’m not a fan of the twin 6/eight pin GPU cable because it might put as much as 300W of load on a connector designed for 150W. Moreover, because the PSU can’t be used with out the ATX cable, I see little worth in making that detachable (although many PSU producers do that for a totally modular design). Admittedly, makes use of for an ATX PSU with out the ATX cable are very restricted however they do exist – mining rigs and 3D printers come to thoughts as widespread examples. I would like the ATX cable be everlasting, then use the area and price financial savings to place the third 6/eight pin GPU connector on a separate cable. I may even go so far as suggesting the four/eight pin EPS12V cable be everlasting as nicely since it might be extremely unlikely for a PC that wants a 650W PSU to not use it.

The Power Supply

Onto the PSU itself, we see that it’s a common 100-240V design like virtually all PSUs available on the market. The complete rated output is obtainable on 12V, precisely what’s desired for contemporary PCs which are largely 12V masses. The 5V can get pushed on PCs which have plenty of USB ports, however that’s an issue that’s fixing itself as quick cost succesful USB-C ports are powered by their very own voltage regulators from 12V.


The fan has EVGA logos embossed onto the blades. I speculate they work just like the dimples on golf balls to barely enhance aerodynamics. However as we’ll see later, that isn’t more likely to play any vital position in thermal design.


On the entrance are the output connectors, together with the EVGA emblem and a warning to not take away the duvet.


The again aspect has the facility enter and repair change as we anticipate, together with a change labeled “eco”. The remaining space is taken up by the rear vents.


Even the underside isn’t so boring with the EVGA emblem once more and a few stickers. No concept what use is a “warranty void if removed” sticker that doesn’t need to be eliminated to open the case.


Now comes the thrilling a part of opening it up and making an attempt to know the way it works. Do beware that such an motion is just to be carried out by skilled electrical engineers and as typically stated on Mr. Carlson’s Lab (a well-liked electrical engineering TV present), “There are high voltages inside and if you’re following along, you’re doing so at your own risk.”

The very first thing we discover is a bit of plastic masking a part of the fan. The intent is clearly to direct airflow nearer to the middle of the board, however it’s clearly not a really aerodynamic approach to do it. A considerably higher strategy to do it’s to set the board nearer to the again so there’s much less airflow to redirect within the first place, then use a bent piece of plastic that works higher for guiding airflow.


Inside, we begin with a reasonably typical association with an lively PFC enter stage going into a big 400V capacitor, full with a relay to bypass the precharge NTC for an effectivity increase. However past that, issues aren’t so typical anymore. As an alternative of the complete bridge design widespread in trendy PSUs of that energy degree, it’s a half bridge design that saves a number of value and complexity – two fewer transistors and one much less gate drive circuit. The half bridge design was thought-about unreliable because of excessive ripple present via the enter capacitors, however relaxation assured this PSU has finished it proper.

The 2 red-orange movie capacitors subsequent to the transformer are what take the ripple present, one thing they do a lot better than electrolytic capacitors do. Then the 12V is synchronously rectified by four MOSFETs and the 5V and three.3V generated by two voltage regulator playing cards close to the underside proper. There isn’t a scarcity of capacitors on the output, each on the primary board and the connector board, which ought to make for very low ripple. Uncommon for a standard ATX PSU, the controller chips are all customized elements that make it inconceivable to seek out the datasheets.


Wanting extra intently on the output aspect, there’s an electrolytic capacitor crammed proper up towards the heatsink. The design engineer should have been brief on time to get the format out for assessment since there seems to be loads of room to area issues out. There additionally seems to be too little thermal grease on the output MOSFETs.

EVGA has been fairly good at gluing elements to protect towards vibration, however they appear to have missed the fan management board and the 2 controller boards. Apparently sufficient, the excessive voltage controller board does have a plastic insulator glued to it (indifferent once I pulled it again to verify what’s beneath) and warmth shrink to carry the insulating plastic in place with out having to make use of glue. I think someplace within the making of the meeting directions, the instruction to attach the controller board to the close by heatsink received misinterpreted as to attach the insulating plastic to the controller board. The low voltage controller board likewise can use a drop of glue to carry it to the close by transformer.


Flipping the PCB over, the close to good fame of this PSU continues to point out blemishes. The surplus of solder on one transformer pin and a bit too little on one other stick out like a sore thumb together with stays of flux that wasn’t utterly cleaned. I’ll undoubtedly be cleansing it up earlier than reassembling it for future use, however EVGA ought to pay attention to it and evaluation their QA checking. We additionally see that to enhance voltage regulation, the voltage sensing is completed on the output connector board.


Powering up the naked board with some load reveals that there are vital losses within the transformer in addition to within the PFC circuit. Surprisingly for a PSU that makes use of customized management chips, probing with an oscilloscope exhibits no try to spice up PFC effectivity by gating the PFC drive alerts at mild load. Blame it on the 80 Plus specification that doesn’t present any incentive to spice up effectivity under 20% load for the Gold tier, whereas the PSUs that do function PFC gating are typically server PSUs the place mild load effectivity does present up on the system energy utilization specification.

Testing and Outcomes

Onto the testing, the standby energy draw was wonderful at zero.14W. So little, in truth, that the TP-Hyperlink sensible plug I used to be utilizing initially was not capable of detect it and I needed to change to a Mooshimeter to make the measurement. Now the adapter to allow the PSU is put in, at which level the idle energy draw is 5.7W with eco off and 5.4W with eco on. Or about as a lot energy as a couple of indicator LEDs, which isn’t a lot. It will be extra correct to label it the “silent” change.

It’s time to see what a trusty oscilloscope makes of it. With the oscilloscope operating on batteries to attenuate noise and set to a 20MHz bandwidth, we get 7.93mV RMS ripple on 12V, four.07mV RMS on 5V, and four.19mV RMS on three.3V. (For causes past the scope of this evaluation, the noise flooring all the time will increase with extra bandwidth. Thus a 20MHz restrict permits constant readings when utilizing oscilloscopes of various bandwidths). All of these measurements are achieved with a 1-ohm energy resistor to take the voltage regulators out of a “period skip” mode that may give false readings. These values are all wonderful and are of specific curiosity to SDR experimenters making an attempt to attenuate noise.

Placing it beneath load, it carried out about in addition to anticipated, favoring excessive masses. The one meter I’ve able to measuring such a excessive present – a Radio Shack clamp meter – reads about 2% low so a correction issue was utilized. The voltage regulation is unmatched and didn’t transfer one bit whereas loaded – not shocking when wanting on the design.

Iout (12V)Vout (12V)PoutPinEff (%)5.1214512.2462.697781.417.68217512.2494.0311383.2110.242912.24125.3714884.7115.3643512.24188.0622185.0920.485812.24250.7529086.4625.6072512.24313.4335787.8030.728712.24376.1242488.7135.8501512.24438.8149389.0140.971612.24501.4956289.2346.0930512.24564.1863189.4151.214512.24626.8769690.0755.3116612.24677.0175489.79



As of October 2018, PCPartPicker lists the EVGA Supernova 650 G3 at slightly below $60, the most cost effective identify model 650W PSU with a minimum of an 80 Plus Gold score. The most cost effective identify model 650W PSU they listing is about $48 and solely has an 80 Plus Bronze score, so not value going cheaper.


The ripple readings are wonderful, the voltage regulation is unmatched, and the effectivity is fairly good assembly its rated specs. I might have favored to see higher effectivity at across the 50-100W area the place most trendy PCs idle, particularly contemplating they went to the expense of utilizing customized management chips.

Design/construct high quality

The twin 6/eight pin GPU cable can put as much as twice as a lot load on the PSU aspect connector as recommended by the PCIe specs, there’s an electrolytic capacitor crammed proper towards a heatsink when it might have been designed with extra spacing, the soldering might be improved in a number of spots, and the management boards can use a bit extra glue to carry them in place.

General, I think about it a great PSU, though I might not advocate it for a LAN get together PC resulting from weak spots in vibration damping. For a house or workplace PC, it’s a nice selection.

Click on to seek out out what this implies

Mike (NiHaoMike)

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