Socket 940

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

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.

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]

References

^ Kronlund, Doug (2004-06-27). "Socket 940 vs. 939". Short-Media. Retrieved 2007-01-28.
^ Bert Töpelt; Daniel Schuhmann; Frank Völkel (2006-05-23). "AM2: AMD Reinvents Itself". Tom's Hardware Guide. Retrieved 2007-01-28.