[Patrix]

Socket 479 (mPGA479M)
This is the socket first used for Pentium M mobile CPUs. It has 479 pin holes. It uses a screw mechanism to secure the CPU onto the socket.

Since there is only 1 pin missing, the socket can physically fit both socket 479 CPUs and Socket M CPUs. So, to add to the confusion, some motherboard manufacturers actually used this type of socket as an "universal dock" for both socket 479 CPUs and Socket M CPUs, which includes some of the Core 2 Duo mobile CPUs (Merom). This is accomplished by using chipsets that can accommodate both types of CPUs.

Missing Pin: A1
Diagram: http://www.x86-guide.com/en/articles...79M)-no28.html
Document: ftp://download.intel.com/design/mobi...s/29852001.pdf

Socket M (mPGA478MT)
This is the socket first introduced for Core Duo mobile CPUs. It was continued to be used for early Merom C2D mobile CPUs. It has 478 pin holes. It uses a screw mechanism to secure the CPU onto the socket. For some of the laptop motherboards, this socket is in "Gold" color.

Missing Pins: A1, A2
Diagram: http://www.x86-guide.com/en/articles...8MT)-no24.html
Article: http://www.pcstats.com/articleview.c...id=2062&page=5

http://www.hardwareanalysis.com/content/topic/71707/
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