Smartidiot posted this over at AMDZone a few weeks ago:
http://support.amd.com/de/Processor_TechDocs/31116.pdf
TO GET THE FULL BENEFITS OF C3, THE MOTHERBOARD NEEDS A BIOS UPDATE! A lot of these sites are testing it without the new BIOSes. The Northbridge has p-states now that are obviously not in use (as the NB clock is running full speed) in all the tests I've seen. We should see even more power savings coming.
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