Seasonic S12II: 330W to 500W of Silence

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



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



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.