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
This article is part of the CPU socket series

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.

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 only the acceptance of registered memory.^[1]

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.^[2]

See also

• List of AMD microprocessors

References

1. ^ Kronlund, Doug (2004-06-27). "Socket 940 vs. 939". Short-Media. http://www.short-media.com/articles/socket_940_vs_939. Retrieved 2007-01-28. 
2. ^ Bert Töpelt; Daniel Schuhmann, Frank Völkel (2006-05-23). "AM2: AMD Reinvents Itself". Tom's Hardware Guide. http://www.tomshardware.com/2006/05/23/amd_reinvents_itself/page2.html. Retrieved 2007-01-28. 

External links

• AMD Product Information
• AMD Technical Details for Athlon64 and Athlon FX
• AMD Socket 940 Design Specification