It has been 16 months since our last power supply review, but the long wait is finally over. We have a new PSU and cases editor, and this is the first of many new PSU reviews to come. The first PSU to hit our new testing lab is the S12G 650W from Seasonic. Seasonic is a company that hardly requires any introduction; they are one of the oldest and most reputable computer PSU designers, manufacturers and retailers. Today, their products are held in very high regard by experts and enthusiasts. The company has their own retail range but they also serve as an ODM for many other well-known brands.

The target groups of the S12G series are advanced users, enthusiasts, and generally those who are not afraid to pay a bit more for advanced performance. It has impressive specifications and features, including an 80 Plus Gold efficiency certification and a "Smart and Silent Fan Control", as well as a five-year manufacturer's warranty. Despite that, it does not really break the bank, as the 650W version that we will be testing today retails for $89.99 plus shipping, a price that appears quite reasonable for such a product.

A year or two ago, you would have had a hard time trying to find a high quality 80 Plus Gold certified unit for that kind of price; however, today Seasonic's retail range has tight competition from several other manufacturers, such as Antec, EVGA, Rosewill, and others. As the Seasonic S12G is not a modular unit and doesn't really include any special features, the company clearly relies on quality and performance above all else; middling quality and average performance cannot be tolerated when several other manufacturers are breathing down your neck. Let us see if the 650W version of the S12G can live up to Seasonic's reputation.

Packaging and Bundle

Seasonic supplies the S12G PSU inside a fairly well designed cardboard box, with a black/blue color theme. The front of the box is tidy, with just a few badges with the certifications of the unit on display. The sides and rear of the box however are littered with information about the unit, in several languages.

Companies rarely supply anything noteworthy alongside their PSUs, especially the non-modular models, but the Seasonic S12G appears to be an exception. Besides the usual power cord, manual, and screws, Seasonic also includes a few cable ties, three blue/black velco cable straps, and a case badge with the company's logo.

The Seasonic S12G 650W PSU
Comments Locked


View All Comments

  • tynopik - Monday, March 3, 2014 - link

    > Shorting a component = OCP protection. I always perform such tests before proceeding to testing the unit.

    good to know, thanks

    > Still, that is not a fault of the PSU, it is an issue with your energy supplier.

    Disagree. No matter what the input is to a power supply, there are only 2 acceptable outputs: in-spec power or nothing.

    It should NEVER put out-of-spec power on the rails, period.
  • RAYBOYD44 - Monday, March 3, 2014 - link

    My Uncle Jordan recently got Lexus GX 460 SUV from only workin on a pc at home...
  • GrahamATrotmann - Monday, March 3, 2014 - link

    n a PSU with a fan. Waste of money when my main reason for getting it was negated. I heard the new generations of Seasonic are almost always silent, but I'm happy with the SilentNight, too.*9142*5469
  • Ram21 - Monday, March 3, 2014 - link

    So, maybe I am blind, but how long are the cables? In previous power supply reviews, there were info graphics that had the lengths each type of cable. Great review, and looking forward to seeing more reviews with this level of detail.
  • HangFire - Tuesday, March 4, 2014 - link

    I agree! While mundane, cable lengths and connector types and counts are an essential part of any power supply review. Anyone buying a power supply is doing so for a reason, often because their current P/S is short on power, connectors, or cable lengths to accomodate a recent upgrade.
  • tynopik - Tuesday, March 4, 2014 - link

    > It is entirely realistic, simply because a) they are unusual and b) are not a problem of the PSU itself but a problem caused by your grid.

    Saying problems with the grid aren't caused by the PSU is
    a) true
    b) irrelevant

    What matters is that power problems do happen in the real world and thus the PSU has to deal with it

    what is 'unusual'?

    Once every five years is unusual, but that doesn't mean having your computer blow every five years is acceptable

    It IS a problem of the PSU because the PSU has to be able to handle 'unusual' events and at all costs protect the components connected to it.

    Any PSU that puts out enough voltage to fry the attached components is a FAILURE, no matter what the input is or how unusual it is.
  • Popskalius - Thursday, March 6, 2014 - link

    other than modularity, is there a difference with the SeaSonic SSR-650RM 650W. You guys think $15 more is worth being modular?

Log in

Don't have an account? Sign up now