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[Matt]

I needed a power supply, so I figured I'd try the new Kingwin Lazer 550W Platinum.  

It's the first Platinum certified (80-plus certification) power supply to be available in North America.

There's an in-depth review here:
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=219

This power supply is over 90% efficient at almost all loads, and is totally silent / passive until it's drawing a lot of juice.

My results, measured with a Kill-a-Watt with the computer at idle:
Seasonic SS-600 (one of the most efficient PSUs in 2006 when I bought it): 114W watts
Kingwin Lazer 550W: 97W at idle

That's almost 1/6 less power to do the same thing.  It's pretty fun to see computers get faster AND more efficient.