High Quality Content by WIKIPEDIA articles! Socket 940 is a 940-pin
socket for 64-bit AMD server processors. This socket is entirely
square in shape and pins are arranged in a grid with the exception
of four key pins used to align the processor and the corners. AMD's
Opteron and the older AMD Athlon 64 FX (FX-51) use Socket
940.Microprocessors designed for this socket were intended to be
used in a server platform, and as such provide additional features
to provide additional robustness. One such feature is only the
acceptance of registered memory.There is a new 940-pin socket
called AM2. Despite having the same number of pins, Socket 940 and
AM2 are not pin-compatible. This means a Socket 940 processor will
not fit in an AM2 socket and vice versa. This is because all 64-bit
AMD processors integrate the memory controller onto the CPU die
rather than have a discrete chip on the motherboard.
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