There's no guarantee the BIOS or even chipset in your laptop will support other processors. There were quite a few changes from MP4->MP4M->M. You might have some chance of getting an MP4M to work but the performance isn't much better. If I remember it mostly added reduced power modes, which makes me think your chipset isn't likely to support it.
If I found one on the cheap I might give it a try. Otherwise I'd put the money into something alltogether different. Buying the processor plus memory plus the used value of your laptop would be very close to that of a new laptop. Faster, cooler, more memory, bigger HD, etc.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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