Linked by Thom Holwerda on Mon 9th Feb 2009 23:25 UTC
AMD "The ink is barely dry on AMD's Socket AM2 Phenom II launch, but Sunnyvale is making up for lost time when it comes to debuting new products. On Monday, February 9, the CPU manufacturer released a total of five new Phenom II-class processors, all of which are classified as Socket AM3 parts. Unlike Socket AM2 chips, which are only compatible with DDR2 memory, Socket AM3 CPUs can use either RAM standard and drop neatly into either motherboard. The backwards-compatibility of Socket AM3 chips should make them quite attractive to anyone upgrading an older Athlon 64 X2 or even a Phenom part; AMD's Phenom II (aka Deneb) offers a number of significant performance and thermal improvements over the ill-fated Phenom I. Remember that backward compatibility only goes one direction - AM2+ processors will not work in AM3 boards."
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RE[2]: Whooopie!
by garf on Wed 11th Feb 2009 02:02 UTC in reply to "RE: Whooopie!"
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The memory controller is now inside the CPU instead the chipset. To support DDR3 the controller needs more "wires" than to support DDR2, so the socket needs more contacts.

Just to correct you, AMD processors have had the memory controller integrated for ages, I think since the first 64 bit chip....

Secondly, the AM3 socket has 938 pins, where as AM2/AM2+ has 940... so that arguement doesn't really stack up...

Infact, at toms hardware, they tried to put an AM2+ Phenom 2 chip into an AM3 mobo by breaking off the two offending pins... that didn't work, but putting the chip back in an AM2+ board minus the two pins still worked... weird..

Just thought I would clear that up.

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