Posted On: Mon, Aug-17-2015
Reviewer: OklahomaWolf
Product: EVGA Supernova G2 550W
Product Link:
Supplied By: EVGA
Price: $84.99 @ Newegg


We're back in the saddle with EVGA again today, this time looking at the G2 550W unit. This has been an amazing series of units thus far at the higher power levels, and I'm looking forward to finding out how consistent the performance is down at the lower powered end of the scale. Let's check it out now, shall we?

Page 1 - Marketing

Another week has started, and with it comes another new power supply review. Not too long ago, we looked at EVGA's 650W G2 unit, and found that thanks to the always excellent Leadex platform therein, it did rather well. But it's never a bad thing to take a look at multiple units within a line, just to see if things stay consistent.

And that's what brings us here today with the G2 550W unit. We're going to see if these units remain strong contenders even all the way down here at the 550 watt level.

Feature wise, this unit is exactly the same as the 650W model, as can be expected. We have the same switchable semi-fanless mode, the same full modularity, the same protections... indeed, even in the specs there's not a lot different from the larger model. There's a little less 12V capacity, and that's really about all.

So, how about we cut to the chase and start unpacking? Good to see these units are still well protected inside the retail box.

We have a user guide, a power supply, some cable ties, a power cord, a modular cable bag, some modular cables, some screws, and a self test adapter. EVGA's still really piling on the accessories with these models, and I like it.

The user guide is the same one that came with the 650W model, so we'll forgo looking at it this time. It's just as well done as last time.

A quick look at the accessories before we move on. About all I have to complain about here is that those cable ties tend to shed little black specks when you pull them apart, thus dirtying up my white photography bedsheet.

Page 2 - First Look and Cabling

As can be expected, this unit looks exactly like its big brother. The housing is identical.

Except for the load table stickers, of course.

Some power supplies offer two sets of mounting holes so that their units can be mounted any way you wish. This isn't one of those units, not that it usually matters much on many of today's cases. Most of mine offer dual sets of mounting holes, so having the extras on the power supply is not needed.

Ah, it's time to fix up a load table. We have 2A less 5V capacity and 8.3A less 12V capacity than the 650W model... that's all. Of course, EVGA still rates this as being able to do full power at fifty degrees. Gotta love that.

550 G2
3.3V 5V 12V -12V 5VSB
22A 22A 45.8A 0.5A 3A
Max Power
@ 50C
110W 549.6W 6W 15W

If you stand on your head, you'll notice this load table is the same as the other one. Go on... stand on your heads. I can't be the only one getting a headache right now.

It comes as no surprise to me that the modular connectors are also identical to big brother. The two units are simply too close in capacity to make any real changes here.

For the record, you're dealing with Torx T-20 screws to mount the fan, and T-8 screws to get inside the unit on this model. Of course, you will have to kill the warranty to mess around with that stuff, and it's never good to do such things if you're not trained for that sort of thing.

I have to admit, I'm really digging the aesthetics of the top panel on these units lately. It's not just a couple of boring stickers. Looks good to me.

Most of the cabling on this unit is identical to big brother. I know, I know, it's quite a shock. Yes, there are capacitors in most of these cables, which makes modding a little more difficult.

Two PCI-E cables come with this unit. In a strange turn, one is a single 6+2 pin affair, while the other... this here 6+2 pin and 6 pin cable. So, if you use both cables, you get three connectors. Odd.

The 650W model had two Molex chains with it. This one has only the one chain. No complaints here... I don't need many of them in a build these days, unless I'm building a crypto miner.

This unit comes with as many SATA chains as the 650W model did. No complaints there... it's a little overkill for a 550W model, but we'll take the extra cable anyway.

And of course, the only Berg connector is on an adapter. The way I like them.

While the 650W model had a combo CPU cable with both an 8 pin and a 4+4 pin connector on the end, this one only has the one 4+4 pin connector. This is really all we needed for both models, I reckon.

Cabling - EVGA 550 G2
Type of Cable Length from PSU
Modular Cables
24 pin ATX connector 590mm
4+4 pin EPS/ATX12V 700mm
6+2 pin PCI-E 700mm
6+2 pin PCI-E, 6 pin PCI-E 700+150mm
5.25"+5.25"+5.25" 500+95+95mm
5.25" to 3.5" adapter 100mm
SATA+SATA+SATA 510+100+100mm
SATA+SATA+SATA 510+100+100mm
SATA+SATA+SATA 510+100+100mm
Unit Dimensions (L x W x H)
165mm x 150mm x 86mm

It's time to move on and get with some load testing. Next page!

Page 3 - Cold Testing

Since this unit is a smaller version of the 650W G2, we'll load test it the exact same way with the exact same equipment. Accounting for the lower capacity, of course. One SM-268, one Tektronix TDS-2012B, one Rek RF9901, one dual probe thermometer, and one Extech DMM.

And many, many cans of soda.

Results from EVGA 550 G2
STANDBY load tests
Test # +5VSB DC Watts/
AC Watts
P.F. Eff.
1 0.5A 2.53W/
0.336 77.8%
2 1.5A 7.50W/
0.473 77.1%
3 3.0A 14.8W/
0.530 76.3%

Starting off with the standby load tests, we see nothing we haven't seen before with this platform. Efficiency is above average, regulation is a very good 2.4%.

Let's run the main tests.

Results from EVGA 550 G2 COLD load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1A 1A 3.5A 55.9W/
117.1V 85.0% 0.958 29C/
3.30V 5.03V 12.19V
2 1.5A 1.5A 8A 117.5W/
116.4V 89.2% 0.971 30C/
3.30V 5.03V 12.19V
3 3.5A 3A 20A 279.6W/
115.3V 90.7% 0.990 31C/
3.28V 5.01V 12.16V
4 5.5A 5A 32A 443.4W/
115.6V 89.8% 0.994 31C/
3.26V 4.99V 12.13V
5 7A 6A 40A 554.7W/
115.7V 88.4% 0.995 31C/
3.26V 4.99V 12.12V
CL1 13A 13A 0A 112.2W/
116.3V 83.0% 0.971 31C/
3.26V 4.99V 12.20V
CL2 0A 0A 45.8A 559.6W/
114.9V 88.9% 0.994 31C/
3.28V 5.01V 12.11V

I was somewhat surprised to see that semi-fanless mode didn't last as long as the 650W unit today. That one, it still went fanless in test three. I'm not worried, mind you, but it's interesting all the same.

Efficiency is a clean pass for Gold, with tests two, three, and five easily clearing their marks. Even the low load test, which is now test one, still looks good for efficiency.

Let's computerate some numbers and come up with the load regulation numbers on the main rails. I'm getting 1.2% on the 3.3V rail, an excellent result. The 5V rail comes in at 0.8%, which is better than excellent. Finally, the 12V rail brings in an amazing 0.6% number, making it the best of the three and leading to a very attractive average value of 0.87%. If it can do this again in the hot box, EVGA's going to be happy later. And so will I.

Page 4 - Hot Testing

Overshoot Transient Testing - EVGA 550 G2
VSB to Full, 12V
Off to Full, 12V

It comes as no shock to me that the overshoot transient test results look this good. Every time I've seen this platform, it has simply been excellent here with no untoward voltage peaks, no going into the negative, and no issues at all with risetime. We'll just move on.

And that means this unit now has a date with the hot box. Because this unit is small, normally the box doesn't get that hot. But today, we're in the middle of a heatwave and even in the basement it's more than thirty degrees in here. I'll turn on the exhaust fan in the hot box, leave the intake off, and that should be enough to get the box plenty hot today.

Results from EVGA 550 G2 HOT load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. P.F. Intake/
Progressive load tests
1 1A 1A 3.5A 55.9W/
117.7V 84.3% 0.960 30C/
3.30V 5.03V 12.19V
2 1.5A 1.5A 8A 117.4W/
116.7V 88.9% 0.971 33C/
3.30V 5.03V 12.18V
3 3.5A 3A 20A 279.5W/
115.5V 90.5% 0.990 36C/
3.29V 5.01V 12.15V
4 5.5A 5A 32A 443.2W/
116.0V 89.6% 0.994 41C/
3.27V 5.00V 12.12V
5 7A 6A 40A 553.9W/
115.4V 88.1% 0.995 44C/
3.26V 4.99V 12.10V
CL1 13A 13A 0A 112.2W/
116.1V 82.9% 0.973 38C/
3.27V 4.98V 12.19V
CL2 0A 0A 45.8A 558.6W/
115.3V 88.7% 0.995 44C/
3.28V 5.01V 12.09V

And plenty hot it did get. Forty-four degrees. And the unit had no issues with that. It kept the fan off the exact same time period it did in the cold tests.

Efficiency was down from the cold tests, but not to the point you and I should worry about it. We still have a super squeaky clean pass for Gold, and that's certainly nothing to complain about.

I'll just calculate the voltage regulation numbers again and see where the unit ends up this time. Let's see... I get the same number as the cold tests for the 3.3V rail, or 1.2%. That goes for the 5V rail as well at 0.8%. The 12V rail slips to 0.7%, but that's not enough to make an appreciable dent in the average result, which is 0.9% and still above the line for me to call it excellent in general.

Last but not least, let's see what the ripple looks like.

Oscilloscope Measurements - EVGA 550 G2
Test #

Hey, is the scope even hooked up? Let me check... and yeah, it's hooked up. Holy macaroni with guacamole, is this ever outstanding. We have less than 10mV on all rails, and this may have just set a new benchmark for ripple control. I mean, this is even lower ripple than I got with the Antec CP-850, and that unit blew my mind. It's not often you see a unit beating Delta at their own game, but here we are.

Page 5 - Disassembly

Of course, I'll take this unit apart. Here's our ball bearing fan of the day, which will see no deduction in the score for fan quality.

The Super Flower Leadex platform is starting to look very familiar now. This looks very much the same as the 650W.

No line filtering here - it's all done on the mainboard.

Soldering quality is excellent on my review unit.

There's our line filter. I count four Y caps, two X caps, two coils, and a TVS diode. The primary filter capacitor comes from Nippon Chemi-Con.

A single 5R140P and one diode make up the PFC section. The controller is inside that wrapped up daughterboard on the top right. From experience, I know better than to try and take that wrapper off.

Two 5R199Ps make up the main switchers.

The standby section, featuring a 29604 controller and an S10C60C Schottky.

They're still using that AA9013 PWM controller for these units.

Four 041N04Ns provide the 12V output for this unit. All secondary capacitors come from Chemi-Con.

And that includes the modular connector panel.

Page 6 - Scoring

Performance (40% of the final score) - you probably already know what I'm going to say here. Voltage regulation was excellent, averaging 0.9% in the hot box. No points deducted. Efficiency was a pass for Gold both times. No deduction. Ripple control was amazing, and probably the best I've ever seen, so definitely no deduction there. I saw no issues with anything else, so this unit gets a 10 here.

Functionality (20% of the final score) - this unit gets everything right. Even the CPU cable, which I thought was terrible on the 650W, is done right here today. Semi fanless mode works well, the manual is decent, we got lots of connectors to power anything a 550W unit should power, and the box came with more goodies than I tend to expect with such a small unit. 10.

Value (20% of the final score) - you can get one of these for $84.99 at Newegg right now. That's a fair bit for a unit this size these days, but as always EVGA is right at the bottom of the cost pile when it comes to 80 Plus Gold and full modularity. The nearest competition is their own 550W GS unit at one dollar more money. This is nuts. How are you making any money on these, EVGA? 10.

Build Quality (20% of the final score) - oh, snap... EVGA just got another perfect total score. There's nothing wrong with this unit. Nothing. 10.







Build Quality


Total Score



What more can one say about these units that hasn't been said? The score speaks for itself, really. This thing has the best ripple control I've seen, it's efficient, and it's cheap compared to what little competition it actually does have. I seriously cannot think of one thing to complain about on this little guy. Yeah, having three total PCI-E connectors is a little odd, but that's no complaint for a unit this small. If you need to power two video cards, you're usually in need of something a little bigger than 550 watts.

The Good:

  • excellent voltage stability
  • beyond excellent ripple control
  • fully modular
  • affordable
  • lots of included goodies

The Bad:

  • nothing

The Mediocre:

  • nothing

This review was provided by : JonnyGURU

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