Dell 255watt 80plus Gold PSUs
#1
These two Dell CPUs exceed 90% efficiency in some wattage range. They are rated 80plus Gold. Both can be bought for less than $30 shipped on Ebay.

Here's the 9RD1W ATX powersupply.
http://www.plugloadsolutions.com/psu_rep...Report.pdf

I just bought this T3JNM ATX powersupply from Ebay for $29.99 shipped.
http://www.plugloadsolutions.com/psu_rep...Report.pdf

Here are the entire list of 80plus tested PSUs
http://www.plugloadsolutions.com/80PlusP...plies.aspx

Here is a comparison of a 255 watt Dell 80plus Bronze power supply (not the same as the above two) and it is noticeably more efficient than the Pico Psu and Seasonic SS-350ET. I also saw some other Kill-a-watt comparisons between some low wattage 80Plus Bronze Dell powersupplies and the Pico Psus, and the Dells are noticeably more efficient than the Picos. If the Dell 80Plus Bronze Psus perform better than the PicoPsu, imagine these 80Plus Gold.
http://www.silentpcreview.com/forums/vie...=6&t=58899
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#2
IIRC aren't these slightly bigger than the ATX spec, thus creating potential problems with fit in less flexible cases?

That said, it would be great to find a low-wattage gold PSU. Most of the time my server just idles 24/7 and it would be great to reduce the power consumption.
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Dell 255watt 80plus Gold PSUs0