there is no commercially available 90% or 95% PC power supply in the world!! There are many DC to DC or single output AC-DC power supplies that can reach +90% efficiency level - but not multi output AC-DC power supply for PCs with ATX12V or other form factors. In addition to cost, the technology for making a multi-output AC-DC power supply with universal input voltage is difficult.
The most efficient PC power supply that I am aware of is made by Celetron (http://www.celetron.com/Power-IDF-2003.pdf) which is in the range of 85%. will be very interested to see if anybody knows about a PC power supply (multi output) that is > 90%
.......but even those reach their maximum efficiency only at or near their peak output........
Not really, this is a myth - Computer Multi output PS reach maximum efficiency at or near 50% loading - based on testing several dozen power supplies...go to INTEL's form factor website and you will see the recommended efficiency levels for ATX and other form factors are higher at 50% loading.....
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there is no commercially available 90% or 95% PC power supply in the world!! There are many DC to DC or single output AC-DC power supplies that can reach +90% efficiency level - but not multi output AC-DC power supply for PCs with ATX12V or other form factors. In addition to cost, the technology for making a multi-output AC-DC power supply with universal input voltage is difficult. The most efficient PC power supply that I am aware of is made by Celetron (http://www.celetron.com/Power-IDF-2003.pdf) which is in the range of 85%. will be very interested to see if anybody knows about a PC power supply (multi output) that is > 90%
.......but even those reach their maximum efficiency only at or near their peak output........ Not really, this is a myth - Computer Multi output PS reach maximum efficiency at or near 50% loading - based on testing several dozen power supplies...go to INTEL's form factor website and you will see the recommended efficiency levels for ATX and other form factors are higher at 50% loading.....