Socket 940

Socket 940 is a 940-pin socket for 64-bit AMD Opteron server processors and AMD Athlon 64 FX consumer processors. It was one of the first sockets designed for AMD's AMD64 range of processors.

Socket 940

Type	PGA-ZIF
Chip form factors	OPGA
Contacts	940
FSB frequency	200 MHz System clock 800/1000 MHz HyperTransport link
Voltage range	0.8–1.55 V
Processors	AMD Athlon 64 FX AMD Opteron
Predecessor	Socket A
Successor	Socket F
This article is part of the CPU socket series

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.

Technical specifications

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 the acceptance of only registered memory.^[1]

While the more recent 940-pin socket AM2 is visually similar to this one, the two are electrically incompatible due to the integrated memory controller. Socket 940 CPUs integrate a DDR controller, whereas AM2 models use a DDR2 controller.^[2]

See also

• List of AMD microprocessors