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Socket 479

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Title: Socket 479  
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Subject: CPU socket, Centrino, Socket 478, Infobox CPU/testcases, Pentium M
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Socket 479

Socket 479
Chip form factors Flip-chip pin grid array (FC-PGA2)
Contacts 479 on the socket, 478 or 479 pins on the processor, 478 contacts used
FSB protocol AGTL+
FSB frequency 400 MT/s, 533 MT/s
Processors Intel Pentium M
Intel Celeron M

This article is part of the CPU socket series

Socket 479 (mPGA479M) is the CPU socket for the Intel Pentium M and Celeron M, mobile processors.[1] Normally used in laptops, but has also been used with Tualatin-M Pentium III processors. The official naming by Intel is µFCPGA and µPGA479M.

There exist multiple electrically incompatible, but mechanically compatible processor families that are available in PGA packages using this socket or variants thereof:[1]

Technical specifications

An Asus CT-479 adapter

Socket 479 has 479 pin holes. Pentium M processors in PGA package have 479 pins that plug into this zero insertion force socket. Only 478 pins are electrically connected (B2 is reserved and "depopulated on the Micro-FCPGA package").[2]

Although electrically and mechanically similar, Socket 478 has one pin less, making it impossible to use a Pentium M processor in a 478 board. For this reason manufacturers like Asus have made drop-in boards (e.g. CT-479) which let you use Socket 479 processors,.[3]

Chipsets which employ this socket for the Pentium M are the Intel 855GM/GME/PM and Intel 915GM/GMS/PM. While the Intel 855GME chipset supports all Pentium M CPU's, the Intel 855GM chipset does not officially support 90 nm 2MB L2 cache (Dothan core) models (even though it works, it only works at 400FSB, some 3rd party/user was able to overclock the FSB on 855GM/GME/PM to support 533FSB Dothan Core).[4] The other difference is the 855GM chipset graphics core runs at 200 MHz while the 855GME runs at 250 MHz. In 2006, Intel released the successor to Socket 479 with a revised pinout for its Core processor, called Socket M. This socket has the placement of one pin changed from the Pentium M version of Socket 479; Socket M processors will physically fit into a Socket 479, but are electrically incompatible with most versions of the socket. Socket M supports a 667 MT/s FSB with the Intel 945PM/945GM chipsets.

See also


  1. ^ a b Socket 479 (µPGA479M), CPU-World, retrieved 2009-01-07 
  2. ^ Intel Pentium M Processor Datasheet (PDF) 
  3. ^ ASUS CPU Adaptor Brings Quiet and Cool Performance of Notebook Processor to Desktop Computing 
  4. ^ Intel 855GM/855GME Chipset Platform Design Guide (PDF) 
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