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Difference between AM2 & AM3

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November 13, 2009 9:14:53 PM

What is the difference between AM2 & AM3 CPU'? Are they interchangeable?

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November 13, 2009 10:36:16 PM

AM2 can ONLY run with ddr2 ram and a AM2 motherboard.( AM3 boards use ddr3 ram)

AM3 has BOTH memory controllers on the cpu. So it can work in a AM3 board with DDR3 ram as also in the older AM2+ boards( if there is a BIOS to support them both of course) with DDR2 ram. This will stay the case unless AMD removes the memory DDR2 mem controller from its AM3 cpu

You CAN NOT run a system with a AM2 cpu in a AM3 board.
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November 13, 2009 10:43:29 PM

someguy7 said:
AM2 can ONLY run with ddr2 ram and a AM2 motherboard.( AM3 boards use ddr3 ram)

AM3 has BOTH memory controllers on the cpu. So it can work in a AM3 board with DDR3 ram as also in the older AM2+ boards( if there is a BIOS to support them both of course) with DDR2 ram. This will stay the case unless AMD removes the memory DDR2 mem controller from its AM3 cpu

You CAN NOT run a system with a AM2 cpu in a AM3 board.




Thanks for the quick response. I now know what to do.
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April 30, 2011 4:10:34 AM

Actually, there is a bit more to it than someguy7 said. According to Wikipedia at http://en.wikipedia.org/wiki/Socket_AM3,

Socket AM3 breaks compatibility with AM2/AM2+ processors due to a subtle change in key placement. The AM3 socket has 941 pin contacts[1 said:
while current AM3 processors have only 938 pins.]Socket AM3 breaks compatibility with AM2/AM2+ processors due to a subtle change in key placement. The AM3 socket has 941 pin contacts[1] while current AM3 processors have only 938 pins.


They even include a reference to a trial done by Tom's Hardware, so it might be worth your while to read the Wikipedia article.
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