Socket 479
Socket 479 (mPGA479M) is the CPU socket for the Intel Pentium M and Celeron M, mobile processors. 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:
Socket 478 for Pentium 4 and Celeron series desktop CPUs;
Socket 479 for Pentium III-M (released in 2001);
Socket 479 for Pentium M and Celeron M 3xx (this was the most common version of the socket, and was released in 2003);
Socket M for Intel Core, Core 2 and Celeron M 4xx and 5xx processors; and
Socket P for Core 2 processors.
Technical specifications
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").