for AMD, you get the option of DDR1 (socket 939) or DDR2 (socket AM2). and they will be using DDR3 next (socket AM3 - AM3 CPU's will actually fit and work in socket AM2 aswell).
for AMD, you get the option of DDR1 (socket 939) or DDR2 (socket AM2). and they will be using DDR3 next (socket AM3 - AM3 CPU's will actually fit and work in socket AM2 aswell).