Seasonic S12II SS-430GB 430w ATX PSU

Internals & Cables

Internal Components

In the past, many people have judged the quality of a PSU on its weight and size of internal components. However, with many manufacturers moving on to newer and more efficient ways of designing their PSU's, it has become increasingly obvious that this is no longer a reliable method for gauging a power supply's quality.

Seasonic S12-II 430w Inside Seasonic S12-II 430w Inside
Bearing in mind that this is actually a 430w PSU we're looking at here, the SS-430GB actually has fairly "beefy" internals. Starting at the middle of the unit, we can see the main transformer (responsible for both of the +12v rails), with a smaller transformer sitting to the right (for the +3.3v and +5v rails). In the far right corner is the main capacitor, which is once again larger than I'd expect to see in an average ~400w unit.

As the S12II series is effectively cooled "bottom-up" by a 120mm fan, Seasonic have also taken the liberty of designing the heatsinks in a way that will create turbulence in the airflow thus providing more effective cooling. This should certainly help to keep the three rows of mosfets attached to heat sinks fairly cool.
Seasonic S12-II 430w 120mm Fan

All other Seasonic units we've tested in the past have made use of ADDA fans, and from the image above it's certainly true to say that the S12II series is no different. As i'm sure everyone already knows, 120mm fans generally offer a much better CFM / dBA ratio than their 80mm counterparts, but let's check the exact specs of this fan to see how it might fair in a silent environment:

• Model: AD1212MB-A71GL
• Size (mm): 120x120x25
• Bearing: BALL
• Speed (RPM): 2050
• Airflow (CFM): 80.5
• Noise (dBA): 38.0

With a noise rating of 38dBA, the ADDA fan certainly doesn't win any awards for being the quietest fan on the planet when running at +12v. However, Seasonic will have undoubtedly installed a fan speed controller in the S12II series to ensure that the fan runs no faster than required at any specified load/temperature level. We'll find out for sure over the next page exactly how loud things get under full load.

Cables & Connectors

It's good to see that Seasonic have decided to sleeve all cables right to the very last connector. Many manufacturers only sleeve some of the cables, or sleeve up to the first connector on every cable leaving the PSU looking a bit unfinished. The sleeving job is professional with cable ties holding the sleeving in place, and heat shrink keeping everything neat and tidy.

Seasonic S12-II 430w Cables Seasonic S12-II 430w Cables

In addition to this, all connectors on the S12II are finished in black, with the molex connectors adopting the 'easy grip' design - which should make removal of the connectors from devices easier.

Seasonic S12-II 430w ATX

Seasonic S12-II PCI-E Seasonic S12-II 430w EPS12v
The ATX connector on the S12II is native 24-pin. However, as you can see above, a small block of 4 connectors can be broken off to switch the connector to 20-pin, thus making it compatible with older motherboards. As some motherboards still make use of the P4-12v 4-Pin connector, Seasonic have chosen to include two separate cables for P4-12v (4-pin) and EPS12v (8-pin) standards.
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Most Recent Comments

29-11-2007, 04:38:05

Looks like a great performer for those not wanting to bust their budget on a good PSU.Quote

29-11-2007, 04:39:29

Nice to see some nosie level figures (db-o-meter? ).

Nice job jim.Quote

29-11-2007, 04:41:39

Originally Posted by name='Ham'
Nice to see some nosie level figures (db-o-meter? ).

Nice job jim.
Aye, 'bout time I could produce some graphs on noise levels Quote

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