Differences Between Socket AM2 and Socket 939-Pin | FAQ AMD Athlon
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What are the major differences between socket AM2 and socket 939-pin?
 
Socket AM2 provides support for DDR2 memory. Socket AM2 is almost identical to socket 939 but uses a protective mechanism (a manufacturing “key”) designed to prevent any socket 939-pin CPUs (DDR1 only) from being inserted into a socket AM2 motherboard, and to prevent socket AM2 CPUs (DDR2 only) from being inserted into a socket 939-pin motherboard.