Reviews - Seasonic S12 II Bronze 520W
Sample Provided by: (By OklahomaWolf on Sat, Apr-10-2010)

Page 1 -

Here at, we've been on a little bit of a Seasonic bender lately. We recently looked at two XFX units based on Seasonic platforms, and found that they were mostly awesome units.

Today, as you can see by the above picture, we're going after Seasonic once again with their new S12 II platform, at 520 watts. This is an 80 Plus Bronze certified unit, intended to be placed squarely in the middle of Seasonic's offerings.

Before we get to the good stuff on the next couple of pages - the load testing - we have some marketing to talk about. Recently. I've been warned that my reviews have become perhaps somewhat too zany. So, I'm going to take the clown nose off as I present to you some marketing bullet points. I'm keeping the floppy shoes on though. Won't take them off. You can't make me. Well... that guy in Wichita might be able to, what with the muscles and all, but he's in for a fight.

  • Super High Efficiency [up to 87%]
    Green solution for reducing energy consumption, noise, and heat.
    -Energy consumption, yes. But heat and noise? That depends entirely on the fan controller used.
  • Highly Reliable 105°C Japanese Brand Capacitors
    Exceptionally reliable components extend product life.
  • Ample +12V Outputs
    Enhanced +12V current capability broadens utilization possibilities.
  • Active Power Factor Correction [99% PF Typical]
    Reduces line loss and power distortion.
  • Double Forward Converter Design
    Advanced topology for high efficiency.
    -Advanced? Not so much anymore, but this is one way of providing some efficiency gains in the design.
  • Smart & Silent Fan Control [S2FC]
    Intelligent thermal control balances between noise and cooling.
    -Intelligent? Cool, man! But can it figure out my taxes for me, that's the thousand dollar refund question.
  • 12cm Ball Bearing Cooling Fan
    Increases airflow & lifetime and reduces rotation speed & noise.
  • Soft-Mount Rubber Cushions
    Reduce fan rotation and vibration noises.
  • Ultra Ventilation [Honeycomb Structure]
    Minimizes airflow resistance for maximum cooling.
    -There you have it, folks, a common exhaust grille structure is now a marketing feature.
  • Universal Video Card Support
    Supports new PCI-E video card technologies.
  • All-in-One DC Cabling Design (applies to models 430W and above)
    Supports PC, IPC, workstation and server systems.
    -This one's a bit confusing, and not well explained by either the text or the graphic next to this point. Basically, units above 430W have the cabling to support EPS12V equipped boards, while the 380W version does not.
  • Patented Easy Swap Connectors
    Unplug the connectors easily, quickly and safely.
  • Universal AC Input [Full Range]
    Plug and run safely anywhere in the world.
    -This is a pleasant side effect of the active PFC circuit, rather than a feature in itself. All active PFC designs I know of can be taken anywhere in the world you want to take them, and they will work.
  • 3 Year Warranty
    Our commitment to superior quality.
    -Except it's a FIVE year warranty, right? Seasonic must have changed this since the box was printed up, because the mere presence of the 5 year sticker on the front indicates that it is a later addition. Moreover, Seasonic USA's website itself proclaims that the five years is the correct number.

On this side of the box, we get to see a bit more marketing, graphs, and features. Hmm... apparently, Mr. Packing Peanut wanted to get into the shot. Little did he know I already had the vacuum cleaner out for something else. Mr. P. Peanut won't be bothering anyone ever again.

There's a bit more marketing on this side, too, along with a load table and a list of the connectors present on the unit. Not to mention a heaping pile of certification logos.

Just in case you don't speak-a de English and still want to read the marketing bullet points, the final panel of the box can help you out. Eight languages are represented.

Aha! There's something in the box. Let me just unpack, and I'll show you what's in there.

Inside the box, I found a power supply, a manual, some screws, a power cord, a 5.25" to 3.5" connector adapter, a Seasonic case badge, and last but not least a little flyer that confirms beyond a doubt that this unit does indeed have a five year, and not a three year, warranty.

I must say, the manual is quite well done for such a low powered unit. I've had 750 watt and up units come with less information than this one picture alone shows you.

Here's the power supply itself, done up in that nice matte black I tend to prefer. It's a shallow unit, measuring 140mm from front to back.

Apart from the label side, the remainder of the unit is refreshingly clear of stickers and other adornments.

Here's a shot of the exhaust grille and that honeycomb grille pattern.

Here's the fan shot for you. I must say, I like the understated blue fan grille hub. The unit looks good without being too flashy.

This label is a bit hard to read, so I'll give you the usual load table here:

Seasonic S12-II 520W

+3.3V +5V +12V1 +12V2 -12V +5VSB
24A 24A 20A 20A 0.8A 2.5A
Max Power 130W 480W 9.6W 12.5W

As you can see, the maximum combined 12V limit is 480W, or 40A. That's not too bad for a unit this size.

Octopus! No, wait... one, two, three... Nonopus! There's a Nonopus on my table! Save yourselves! Release the Kraken!

Type of connector: Seasonic S12-II 520W
ATX connector (550mm) 20+4 pin
4+4 pin EPS12V/ATX12V connector (550mm) 1
8 pin EPS12V (550mm) 1
6+2 pin PCIe (590mm) 1
6 pin PCIe (590mm) 1
SATA (430mm+100mm+100mm) 3
SATA (520mm+100mm+100mm) 3
5.25" Drive (430mm+100mm+100mm) 3
5.25" Drive (520mm+100mm+100mm) 3
Single 5.25" to dual 3.5" Drive adapter (150mm) 1
Unit Dimensions(L x W x H)
140mm x 150mm x 86mm

As you can see by the above table, this unit continues Seasonic's tradition of making some of the peripheral cables shorter than others, which can assist in cable management. In an unusual move, the spacing between SATA and Molex connectors is only 100mm on this unit.

You may be asking yourself, "Hey! He didn't say which 12V rail goes where! Why that no good so and so, I oughtta..."

To which I reply: calm down, people. Neither the manual nor the cabling made any indication of what went to what rail, so I popped the cover off. This unit does not have two 12V rails at all - it's a single 12V design. There is no multirail overcurrent protection in there. That'll make load testing easier.


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