Originally Posted by Torn Mind
Efficiency is usually the best at 50 percent of the PSU's load.
You only see a real drop in efficiency at very low loads. Lower wattage units will have better idle efficiency because they'll stay closer to the 20% mark which is the lowest load used in approving 80 Plus certifications. The fact that efficiency is typically optimal at 50% load is not significant.
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Last edited by lehtv; 01-23-2013 at 03:20 PM.