The socket itself was 942 pins, yes, and AM3 had 941, so you'd assume, correctly, that a CPU with 942 pins (am3+ CPU) would not work (fit) inside an AM3 socket. Except, you're forgetting that the amount of pins a socket has, does not denote how many the CPU have AM3 socket = 941 AM3 CPU = 938 AM3+ socket = 942 AM3+ CPU = 940 And i quote: "Some manufacturers have brought AM3+ support to some of their AM3 motherboards via a simple BIOS upgrade. Mechanical compatibility has been confirmed and it is possible for AM3+ CPUs to fit in AM3 boards, provided they can supply enough peak current. Another issue is the use of the sideband temperature sensor interface for reading the temperature from the CPU. Therefore, some CPU PWM fan headers may only run at full speed. Also, certain power-saving features may not work, due to lack of support for rapid VCore switching."