Need help upgrading a Celeron M

[vegasgmc]

Ive got a Compaq C300 with 1.6 Celeron M 420 Yonah. When this laptop came out Intel was using sockets 478 and 479 in laptops. Some of the sockets are also called M and P. Mine a socket 479. I bought a Centrino a few years ago for it but it doesnt fit. At the time I didnt know Intel was using different sockets. Thanks