Seasonic S12II: 330W to 500W of Silence
by Christoph Katzer on September 14, 2007 4:00 AM EST- Posted in
- Cases/Cooling/PSUs
Standby Efficiency
330W Results:
500W Results:
With just 1W to 1.6W the S12II are consuming very little power during shut down mode. Of course it would be better if a power supply could consume nothing while doing nothing, but that's unfortunately too much to ask. A small amount of power is required for features such as Wake On LAN to function, among other things. The standby efficiency is average from both PSUs.
Efficiency
330W
500W
With both power supplies having up to 85% efficiency, the 330W version might be the most efficient small performing power supply in the market. Even with a low 100VAC input voltage, both power supplies still manage to reach 83% efficiency -- this comes at a 100W load on the 330W and a 150W load on the 500W model. High efficiency is achieved a loads ranging from around 20% up until 90% -- and even higher if you have a 230VAC input voltage. Both power supplies manage more than 80% efficiency at almost all loads.
Power Factor Correction
330W
500W
Power factor correction has been good for most of the Seasonic power supplies and with the S12II we don't see any difference. With a higher input voltage PFC is always worse, and especially with the 330W version it doesn't appear to be all that great. However, keep in mind that a 30% load on the 330W power supply equates to a power draw of 100W, which is the same as a 20% load on the 500W model.
330W Results:
500W Results:
With just 1W to 1.6W the S12II are consuming very little power during shut down mode. Of course it would be better if a power supply could consume nothing while doing nothing, but that's unfortunately too much to ask. A small amount of power is required for features such as Wake On LAN to function, among other things. The standby efficiency is average from both PSUs.
Efficiency
330W
500W
With both power supplies having up to 85% efficiency, the 330W version might be the most efficient small performing power supply in the market. Even with a low 100VAC input voltage, both power supplies still manage to reach 83% efficiency -- this comes at a 100W load on the 330W and a 150W load on the 500W model. High efficiency is achieved a loads ranging from around 20% up until 90% -- and even higher if you have a 230VAC input voltage. Both power supplies manage more than 80% efficiency at almost all loads.
Power Factor Correction
330W
500W
Power factor correction has been good for most of the Seasonic power supplies and with the S12II we don't see any difference. With a higher input voltage PFC is always worse, and especially with the 330W version it doesn't appear to be all that great. However, keep in mind that a 30% load on the 330W power supply equates to a power draw of 100W, which is the same as a 20% load on the 500W model.
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Zds - Wednesday, September 19, 2007 - link
Good review on a good product.What seemed a bit misleading, tho, was the statement about suitability of these models to dual-gpu machines. I know many marketing guys favor the "bigger is better", but it would not hurt to you, too, clearing out that the 330W model is powerful enough for practically any single-socket-single-GPU machine, and most of the dual-GPU ones, too and the 500W should be enough for almost any single-CPU-dual-GPU machine..
And as most of the modern machines (C2D/Athlon, not P4) spend most of their time at idle, and most of them idle at 60-100W, the 330W model saves not just your ears, but real money, as you can run the machine at the sweet spot almost all of the time.
gochichi - Sunday, September 16, 2007 - link
I have to say that Seasonic is not a flashy brand, like Antec or something. It's more of a truly better product, it doesn't rely on its name I don't think. Do a lot of people really know this name?From my experience, Antec is just plain average quality with a lot of marketing dollars ... and while I would buy Antec again, I wouldn't choose it over most other brands. In fact, I'd generally avoid it, as 2 Antec PSs burned out on me and 0 of any other brand, even duck brand ones haven't failed on me.
My Seasonic 330W is going strong for 2 years now and my system isn't exactly barebones although this power supply kept me away from the vulgar video card options.
While I'm tempted by the performance features of 8800's and 2900s, it's the elegance of power efficiency and silence that does the trick for me. After going through the very beginning of 3D acceleration, with the original Voodoo, I can attest to the fact that power hungry cards are best regarded as beta versions, as prototypes, as overclocked. As research and development, and priced for zealots.
In any case, I understand going with more wattage on the powersupply, I would do so myself (mostly, b/c I like having different operating systems in different hard drives). But Seasonic is quiet, classy, quality stuff that deserves my recommendation.
I would go as far as to call it an underdog brand, it's not Corsair, it's little mentioned in recommendations... but it's really good stuff. Seasonic is like delicious wine, in a world dominated by beer.
wibeasley - Saturday, September 15, 2007 - link
The 330 version has been at newegg for at least a month. The "II" designation of the series isn't obvious from the title, but the box image shows it. The specifications show it as well, under the "Series" value.http://www.newegg.com/Product/Product.asp?item=N82...">http://www.newegg.com/Product/Product.asp?item=N82...
bryanW1995 - Friday, September 14, 2007 - link
I'll take the 620 hx that I just paid 127 AR at mwave instead of 115 for the 550vx.USAF1 - Friday, September 14, 2007 - link
I'm still waiting to see a review of a Seasonic S12 Energy+ PSU. Seasonic claims a peak efficiency of 88%.Christoph Katzer - Friday, September 14, 2007 - link
Between that one and now are still around 20 other PSUs which are laying around here and want to be reviewed...tynopik - Friday, September 14, 2007 - link
several of the charts such as efficiency, PFC and noise should be done on a watts scale instead of a % load scale. This will enable a direct comparison between alternatives.If i have a 250W load, how does the efficiency and noise compare among the 300, 400 and 550W power supplies? It's impossible to tell currently
Christoph Katzer - Friday, September 14, 2007 - link
For what are the tables of page 6 then?tynopik - Friday, September 14, 2007 - link
well yes i can figure out 50% load on a 500w PS is about 250wso yes it is 'possible' to compare numbers between different reviews, but certainly not easy
and why use % load any ways? how is it relevant?
convenience wise it sure would be handy to make, for instance, a single efficiency chart and a single noise chart with all power supplies that have been tested so far so you could see how they compare across the range of interest
Christoph Katzer - Friday, September 14, 2007 - link
Sounds good with the comparison, have thought about it already for an upcoming price guide.