Seasonic S12G-Series: S12G-550 Power Supply Review

Seasonic builds some of the best computer power supplies on the market. When do we ever get a power supply that is actually a better product than what it is marketed to be? Not often, but that is the case with the S12G-550 PSU. It is not terribly inexpensive, but it is a great value for your hard earned dollars.


In the power supply realm, when consumers think of quiet and efficient power supplies one of the first companies that comes to mind is Seasonic and, today, we have our 16th look at a Seasonic branded unit. This review covers a new line for Seasonic, the S12G Series, with today’s model being the S12G-550 (SSR-550RT Active PFC F3).

Seasonic is one of the older companies producing consumer power supplies having been founded in 1975 and entering the PC power supply production market in 1980. During that more than 30 years as a company Seasonic has cultivated lines of power supplies that are today some of the standard bearers for efficiency and quiet computing. This focus, and its reputation for quality, has lead to an explosion in production as Seasonic can be found providing OEM services on various model lines for Antec, XFX, Corsair, PC Power and Cooling, and of course under its own Seasonic brand.

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Silent Low End Killer?

The Seasonic S12G-550 is the 16th power supply we have seen from Seasonic and, for modern enthusiast units, it falls into the entry level segment of what Seasonic currently offers. Interestingly, we recently had the opportunity to see the G-550 from Seasonic which was an entry to mainstream product so today's S12G-550 is going to be slotted fairly close to that previous unit. As many other brands have had some issues with dividing up its product lines into too close of categories, it will be interesting to see how Seasonic manages this unit in relation to other brands and to the G-550. Before moving on, let's what Seasonic has to say about this unit:

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With little more than a list of features being available we don't have any idea how this unit is going to (or is supposed to I should say) differ in the market from the G-550. Maybe if we move on and see what we have to look forward to when we purchase the Seasonic S12G-550 power supply in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality this will become clear.