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Pentium M vs Pentium 4-M

They are different. Quite fundamentally different. The Pentium M, Celeron M, "Centrino", Dothan is a completely different chip to the Pentium 4-M - the Pentium M at 1.8ghz is roughly equivalent in speed to a 2.8ghz Pentium 4, but uses about 21 watts, whereas the Pentium 4 uses around 80 watts! The Pentium 4-M uses considerably more watts than a Pentium M, but is significantaly slower than the Pentium M. The Pentium 4-M is based on the crappy Pentium 4, the Pentium M is not! There is regular confusion (especially on ebay!) and people think the Pentium 4-M is the same as the Pentium M, they are not the same.

Thankfull, Intel provide a CPU information page:
http://processorfinder.intel.com/scripts/default.asp

You simply put in the CPU code ie: SL7EM brings up a Pentium M 2.0ghz CPU etc. If you enter SL6FH, you get details of the Pentium 4-M. They are not compatible, you can not put a Pentium 4-M in a Pentium M motherboard and vice versa, without an adapter, and even then, there are pretty strict requirements.

Core Solo and Core Duo (Yonah) are sons of the Pentium M line. The Pentium 4 line is slowly going to be fazed out and Dell will be switching over to Pentium M based systems in November in desktop machines... the Pentium 4 is crap (too hot, too power hungry) and is finally going to be put out of it's misery. Hoorah!

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