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

  • Samus - Saturday, March 1, 2014 - link

    Just buy a PCP&C 750 Quad and take the fan out/unplug it. I've had mine like this for 5 years. It doesn't even get warm pulling 300 watts. JohnnyGuru found it to be the coolest running PSU he ever tested at full load, so running 1/2 load doesn't even require active cooling. They have no electronic noise.

    They're $50 used on eBay.
  • tosisgray - Saturday, March 1, 2014 - link

    Thanks! That's the kind of testing I want to see. Embarrassingly, I have not heard of JohnnyGuru before. I will look him up.
  • geniekid - Monday, March 3, 2014 - link

    I've owned 4 Seasonic power supplies. One of them had coil whine, and it wasn't fanless.
  • nagi603 - Thursday, April 3, 2014 - link

    I have an X-400. Best PSU I've ever bought. No buzz, no problem of any kind.
  • MuteyM - Friday, February 28, 2014 - link

    Going forward, it would be nice if the graphs used Wattage instead of Load % on the X-axis. This would make it easier for people to compare differently-rated PSUs for their own particular needs. For example if I know my computer idles around 50W and maxes at 400W, I could compare all reviewed PSUs and see which are the most efficient at my particular use cases.

    With Load % as it is now I have to manually do a bunch of math for that comparison.
  • GiantPandaMan - Friday, February 28, 2014 - link

    Good idea. Or they could just dual axis it.
  • E.Fyll - Friday, February 28, 2014 - link

    That actually is a very good idea. I will see if I can make a dual axis graph or simply replace the % axis with wattage. Thank you MuteyM.
  • lever_age - Friday, February 28, 2014 - link

    It's only Seasonic's X and Platinum lines that use the San Ace fan. All others pretty much use an ADDA.

    Also, the B in AD1212MB-A70GL should indicate it's a 2BB fan, not hypro. This is the model used in most of their power supplies and often even the ones they build for other brands.
  • lever_age - Friday, February 28, 2014 - link

    ...that is, in the current lineup. Prior M12D or whatever previous high-end model may have also used San Ace.
  • Flunk - Friday, February 28, 2014 - link

    Not to nitpick, but if you're putting together a "powerful cyptomining system" you generally don't use a case at all. Not only that, but you're going to need more powerful or multiple power supplies.

Log in

Don't have an account? Sign up now