Today we are getting acquainted with a new power supply unit (PSU) manufacturer, Cyonic. It is very likely that most of the people who are reading this review have never heard of the brand before. We should start by mentioning that Cyonic is a brand dealing solely in Seasonic hardware, with Seaonic one of the major PSU manufacturers worldwide. To clarify the arrangement here, Seasonic sells power supplies to companies like Cyonic to sell on and is not an uncommon way of distributing product. Although in some markets Seasonic does sell as their own brand direct to the end user. The Cyonic name and company was founded just two years ago in Asia and is reluctantly making steps into the North American markets. Cyonic's brand profile and mission statement is, in summary, that they are aiming to provide high performance products to advanced PC users. Cyonic currently offers very few products; only three series and nine PSUs total, with three of them exclusively available in Japan.

The other two series that Cyonic currently offers are the AU and AUx. Both of these series consist of three PSUs each, and the units between the two series are essentially identical, with the sole difference being that the AUx models are modular and the AU models are not. Each series has one 450W, one 550W and one 650W model - if you are looking for high power behemoths, Cyonic is the wrong brand name. Furthermore, all three PSUs in each series are based on the same platform. As such, this review of the AU-550x essentially covers the entire lineup of products that Cyonic currently offers.

Power specifications ( Rated @ 40 °C )
AC INPUT 100 - 240 VAC, 50 - 60 Hz
RAIL +3.3V +5V +12V +5Vsb -12V
MAX OUTPUT 20A 20A 45A 2.5A 0.3A
100W 540W 12.5W 3.6W

Packaging and Bundle

Cyonic is supplying the AU-550x into a medium-sized, sturdy cardboard box with a striking yellow artwork theme. It offers ample protection to the small unit and all the basic specification and features are printed on its sides and rear in multiple languages.

A nice number of extra items are bundled with the AU-550x. Cyonic supplies the basic AC power cable, a multilingual manual, a quick installation guide and four black mounting screws, as well as several black cable ties, three long quality cable straps and two case stickers to choose from. Thumbscrews or a small bag for the cables would be nice, but this bundle is still better than most.

The Cyonic AU-550x is a fully modular PSU and every cable is supplied detached from the unit. With the exception of the sleeved 24-pin cable, all of the cables are "flat", ribbon-like, including the supplied Molex to Floppy connector adapter. All of the cables, including the ATX 24-pin cable, are made using black wires and black connectors.

Cyonic AU-550x
Connector type Hardwired Modular
ATX 24 Pin - 1
EPS 4+4 Pin - 1
EPS 8 Pin - -
PCI-E 6+2 Pin - 2
PCI-E 8 Pin - -
SATA - 7
Molex - 4
Floppy - 1
The Cyonic AU-550x PSU
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  • marraco - Monday, August 17, 2015 - link

    Anandtech needs to learn a lot about reviewing a PSU.

    Where are the power on tests? They are critical.

    How does it behaves when each rail is fully loaded? Does it really deliver? Most PSU don't.

    How much AC noise and ripple contains the signal under different loads? Those small peaks may slowly erode your hardware
  • E.Fyll - Monday, August 17, 2015 - link

    By "Power On" tests, I assume that you are talking about the AC input and care about the inrush current and harmonics.

    Power On tests require a very good oscilloscope with current probes and a programmable AC source. These are equipment in the tens of thousands of dollars. Although there are plans to purchase them in the future, you need to excuse me that I do not possess such funds to spend for just a couple of more tests.

    ...and not practically useful tests either. Power On tests are everything but "critical". They are virtually limited to compliance certification. The inrush current or the harmonics generated by a PSU will not affect its performance. Harmonics may affect other very sensitive devices on the same line, such as audio equipment, but again these need to reach extraordinary levels to become an issue. Inrush current could cause your household circuit breaker to release if it is too high, but 99.99999999% of the readers cannot really calculate and compare the current-time (I-t) curve of a PSU against the I-t curve of the circuit breaker. If I gave them a curve with a maximum current of 170A over a few nanoseconds, most people would think that their house would catch fire, even though that figure is entirely unimportant. 99.99% cannot even differentiate between power and energy, they cannot comprehend that timeless figures do not tell any side of the story at all.

    Now, if you are talking on the DC side, they become critical only if they fail their required specifications. It is very difficult for a PSU not to meet these standards. Once again, a very fast oscilloscope is required for proper testing, but I would report it if something was amiss with the oscilloscope that I am using right now.

    The vast majority (99.9% or more) of the PSUs will behave just fine with each rail loaded to its maximum wattage and current specifications. Heavy ripple may appear due to the cross-loading, but I never saw a single PSU that would not work. We have the cross-loading tests just for that. And, by the way, loading a single rail to the maximum while the rest are unloaded is not a proper usage scenario. By that logic, I should be testing them on mount Everest, just to see if they can work at an altitude of 5000 meters. Even for our cross loading tests, the load is terribly unbalanced and it is virtually impossible to represent a real world scenario. Well, unless if what you want to do is to use a PSU to start a car's engine or to power a welder.

    And since we are on the topic of learning, you can have AC signal on your DC signal (that's ripple) and random fluctuations (that's noise). Page 4 for ripple. For noise, once again you need a VERY expensive oscilloscope, capable of calculating and displaying ripple and noise separately. My equipment cannot currently filter the noise out of a signal.

    And yes, ripple is one of the most important PSU characteristics in my opinion, as it has a significant effect on the lifetime of electronics.
  • ImSpartacus - Tuesday, August 18, 2015 - link

    Whoa, let's calm down there, hondo.

    It's not worth arguing with random people on the internet.

    It's good to read comments and feedback, but spend your time writing articles, not massive comments.
  • dqniel - Tuesday, August 18, 2015 - link

    His comment was filled with useful information, so I'm glad he posted it.
  • marraco - Monday, August 24, 2015 - link

    Thanks for your answer.

    I apologize, because for some reason I didn't noticed the ripple data in page 4. Thanks for including it.
    Some sites specialized on PSU analysis compare each unit with the certificated specification standards, and other units.

    I learnt about the importance of ripple and power on behavior when one of my motherboards died, and a friend told me that my PSU had bad behavior, so the ripple probably damaged it enough for the bad peaks at power on to finish the work.
    He was working at a university, so he didn’t pay for the equipment. I didn’t knew that it was so expensive.

    I'm sorry to hear that you do not have that expensive equipment. I'm accostumed to find here reviews of expensive hardware, and forgot that generally it is lendt or donated by manufacturers.
  • kuttan - Monday, August 24, 2015 - link

    No worry here a good review which is easy to understand and informative. So sites go too much technical in a sense that you need to poses a PhD in electrical science to understand what they say. Some sites do review the opposite way that they do some basic load tests and efficiency tests I'm not naming it who. Anandtech PSU reviews are overall balanced and yet detailed enough.
  • Folterknecht - Monday, August 17, 2015 - link

    Can't remember when/if I saw a Seasonic (based) PSU with 60 mV Ripple, that usually their strong point - bad Sample?


    If you 're working for Corsair now - that's at least what I assume after seeing you in a Techsyndikate Interview regarding single/multi rail designs "recently" - commenting on on a competitiors product seems odd to me.
  • sheh - Tuesday, August 18, 2015 - link

    I still think it would be useful to test with a 50W load, and even 25W. Modern computers don't use much power in light usage.
  • Beaver M. - Tuesday, August 18, 2015 - link

    Exactly. A test like that is mandatory nowadays. You can actually get systems down to 10-15W, if you put some effort into it.
  • DanNeely - Wednesday, August 19, 2015 - link

    It was tested at a sub 50W load. Eyeballing it I'd say it's at most 30W; might only be 25.

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