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Encyclopedia > Socket 940
Socket 940
Specifications
Type: PGA-ZIF
Contacts: 940
FSB : 200 MHz System clock
800 MHz / 1GHz HyperTransport
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. The socket is entirely covered with leads, except for four key pins used to align the processor. AMD Opterons and the older AMD Athlon 64 FX (FX-51) uses Socket 940. Being an intended server platform, processors using this socket only accept registered memory, because, in servers, memory errors are less acceptable and cause more damage.[1] Image File history File links Question_book-3. ... Image File history File links Broom_icon. ... Image File history File links Socket_940. ... Package Diagram for 168-Pin PGA Embedded IntelDX2™ Processor The pin grid array or PGA is a type of packaging used for integrated circuits, particularly microprocessors. ... A large ZIF socket (socket A) ZIF is an acronym for zero insertion force. ... In personal computers, the front side bus (FSB) or system bus is the physical bi-directional bus that carries all electronic signal information between the central processing unit (CPU) and the northbridge. ... HyperTransport logo HyperTransport (HT), formerly known as Lightning Data Transport (LDT), is a bidirectional serial/parallel high-bandwidth, low-latency point to point link that was introduced on April 2, 2001. ... Advanced Micro Devices, Inc. ... The Athlon 64 is an eighth-generation, AMD64 architecture microprocessor produced by AMD, released on September 23, 2003. ... Advanced Micro Devices, Inc. ... The Opteron is AMDs x86 server processor line, and was the first processor to implement the AMD64 instruction set architecture (known generically as x86-64). ... The Socket 370 processor socket, a ZIF type PGA socket A CPU socket or CPU slot is a connector on a computers motherboard that accepts a CPU and forms an electrical interface with it. ... Advanced Micro Devices, Inc. ... The Opteron is AMDs x86 server processor line, and was the first processor to implement the AMD64 instruction set architecture (known generically as x86-64). ... The Athlon 64 is an eighth-generation, AMD64 architecture microprocessor produced by AMD, released on September 23, 2003. ... Athlon is the brand name applied to a series of different x86 processors designed and manufactured by AMD. The original Athlon, or Athlon Classic, was the first seventh-generation x86 processor and, in a first, retained the initial performance lead it had over Intels competing processors for a significant... Registered (also called buffered) memory modules have a register between the SDRAM modules and the systems memory controller. ...


The more common use of Socket 940 is in the Server market. Dual Socket 940 boards use the 200-series Opterons. Four(Common) or Eight(Rare) socketed boards use the 800-series Opterons. The Socket 940 platform is designed for raw power and professional accuracy, not bleeding-edge gaming performance.


There is a new 940-pin socket called AM2. Though the current Socket 940 and the AM2 both share the same number of pins, they are not pin-compatible. That is, a Socket 940 processor will not fit in a AM2 socket. The same is true in reverse; a Socket AM2 processor will not fit in Socket 940. The reason for this is because all 64-bit AMD processors, unlike all current Intel processors, include the memory management functionality not as a discrete chip on the motherboard, but rather on the CPU die itself.[2] That means that, if someone wishes to utilize a newer type of memory (e. g. DDR2 vs. DDR), then AMD would need to manufacture an entirely new microprocessor with entirely new memory management electronics built into the chip in order for that newer memory to be usable. This is exactly the situation here; Socket AM2 is designed for DDR2 memory, whereas Socket 940 is designed for DDR (occasionally called "DDR1") memory. This issue highlights one of the disadvantages of including the memory management functions on the CPU die itself. However, performance benchmarks suggest a significant performance increase by doing so, hence AMD's decision to take this design route. The Socket AM2, renamed from Socket M2 (to prevent using the same name as Cyrix MII processors), is a CPU socket designed by AMD for desktop processors, including the performance, mainstream and value segments. ...


For somewhat related reasons, Socket 939 processors cannot be used in Socket 940 motherboards, even though both Socket 939 and Socket 940 CPUs support the same DDR (aka "DDR1") memory. The distinction here is that Socket 940 requires more expensive registered memory, whereas Socket 939 uses less expensive unregistered memory. There are also issues of electrical capacitance which lead to four-layer vs. six-layer motherboards (the latter are slightly more expensive to manufacture), which was the reason for the genesis of Socket 939; Socket 940 requires six-layer motherboards. This pin-incompatibility was known to cause some frustration when AMD moved the Athlon 64 FX processor, their premier gaming platform, from a Socket 940 (Opteron 1xx) basis to Socket 939; users who wanted more speed needed to purchase and install an entirely new motherboard. AMD's motivation for Socket 939 was entirely driven by perceived total system cost. However, even after this socket change, the Athlon 64 FX series remained a relatively high cost option, even at times slightly higher than a comparable Socket 940 Opteron.[citation needed] Given the Opteron's excellent performance, it was not unheard of for Socket 940 Opteron 1xx sales to actually cannibalize Athlon 64 FX sales, even at times among the FX's target market, gamers. Socket 939 was introduced by AMD in June 2004 to supersede the previous Socket 754 for Athlon 64 processors. ...


Given AMD's recent proliferation of CPU socket platforms, questions about Socket 940's longevity abound on the Internet. Socket 940 was, from the start, primarily geared toward server and higher-end workstation markets, where purchasing decisions are traditionally conservative and customers are known to depreciate (and thus use) their existing gear over at least a five-year cycle. Thus, AMD's plans for Socket 940 stretch out several years into the future, and longevity for this platform is expected to be relatively long. As an example, Socket 5, made famous by the Intel Pentium processor, was in active manufacture, in various backwards-compatible forms including Super Socket 7, for over five years. Socket 370, championed by Intel's Pentium III and Celeron lines, lasted for a similar time frame.[citation needed]


Note that, regardless of the socket form factor, all 64-bit AMD processors will run all of the same software; they are all fully binary-compatible.


Chipsets

Socket 940 motherboards are currently available with the following chipsets:

Socket 940 motherboards are currently available from many manufacturers, including:

References

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

Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... is the 178th day of the year (179th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 28th day of the year in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 143rd day of the year (144th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 28th day of the year in the Gregorian calendar. ...

External links


  Results from FactBites:
 
Socket 940 - Wikipedia, the free encyclopedia (765 words)
AMD Opterons and the older AMD Athlon 64 FX (FX-51) uses Socket 940.
Dual Socket 940 boards also exist, allowing the use of multiple 200-series Opterons, and even four or eight-socketed boards are in existence.
Socket 940 was, from the start, primarily geared toward server and higher-end workstation markets, where purchasing decisions are traditionally conservative and customers are known to depreciate (and thus use) their existing gear over at least a five-year cycle.
CPU socket - Wikipedia, the free encyclopedia (382 words)
The CPU socket or slot is the connector that interfaces between a computer's motherboard and the processor itself.
Most CPU sockets and processors in use today are built around the pin grid array (PGA) architecture, in which the pins on the underside of the processor are inserted into the socket, usually with zero insertion force (ZIF) to aid installation.
In contrast to this, a couple current and upcoming sockets use a land grid array (LGA) in which the pins are on the socket side instead and come in contact with pads on the processor.
  More results at FactBites »

 
 

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