 The "Family 10h AMD Phenom™ Processor Product Data Sheet" (document 446878) has, but contains only a brief list of features of the Phenom, and does not contain any substantive technical data regarding 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 in a different layout while AM2+ processors have 940 pins.