Socket 479

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Specifications
Socket 479

Type	PGA-ZIF
Chip form factors	Flip-chip pin grid array (FC-PGA2)
Contacts	479
Bus Protocol	AGTL+
FSB	100 MHz (Quadpumped), FSB400 133 MHz (Quadpumped), FSB533
Voltage range
Processors	Intel Pentium M Intel Celeron M VIA C7-M
This article is part of the CPU socket series

Socket 479 is the CPU socket for the Intel Pentium M, a mobile processor, normally used in laptops, as well as Tualatin-M Pentium III processors. The official naming by Intel is mFCPGA and mPGA479M. Despite the 479 in the name the Pentium M Processors for this socket use only 478 Pins.

It uses a different electrical pin-arrangement from socket 478, making it impossible to use a Pentium M in a normal 478 board, but yet the Pentium M fits mechanically in a Socket 478. For this reason Asus makes a drop-in board (CT-479) which lets you use socket 479 processors in selected Asus boards^[1]. Currently, the only chipsets for the Pentium M are the Intel 855GM/GME, Intel 915GM and Intel 6300ESB. While the Intel 855GME chipset supports all Pentium M CPU's, the Intel 855GM chipset does not support 90nm 2MB L2 cache (Dothan core) models^[2].

Image:Socket479 Adapter.jpg	Image:Socket 479 Pinouts.jpg
Asus CT-479 adapter	A comparison of the Dothan (Pentium M SL7SM) (left) and Yonah (Core Duo) (right). Both chips have 478 pins, but the placement of one pin has been changed.

Recently, Intel has released a new socket 479 with a revised pinout for its Core processor, called Socket M. This socket has the placement of one pin changed from the original Socket 479 in order to make the different processors incompatible in the incorrect socket. Socket M supports a 667 MT/s front side bus with the Intel 945GM chipset.