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Old 12-07-2008, 08:06 AM   #3 (permalink)
NeilBlanchard
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Hi,

A much better source of info about power supplies is one of my other haunts: Silent PC Review.

silentpcreview.com | Everything about Silent / Quiet Computers

Typical older units were in the 65-75% efficiency range (though some are lower), and now 80-85% are fairly common. A few units are approaching 90% now; and it also depends a lot on your actual consumption. Most computers are 100-200 watts of DC consumption, so add ~25-30% to that for the AC use.
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