difference between pentium 4 and pentium m4

what is the difference, the m4 is newer yet has lower processing speeds... same with the centrino why are they newer but lower precessing speeds.. can someone please explain what intels up to and explain these processes for me?? im so confused...

[Jason425]

for some reason the M processors with the low speeds have similar performance as the non N at the higher speeds. It has something to do with more efficient cycles resulting in better battery life.

M is for mobile

like what jason425 said, the Mobile processors drain less power
but the P4M isnt much weaker than P4

Pentium M centrino is another matter
the clock speed is very slow
from 1.2GHz to 1.8GHz (i dunno the exact range)
BUT
the processor is smarter
and is actually faster than most of the P4Ms even though the clock speed is almost halved

Pentium M centrino also has built in wireless lan 802.11b and many more technology built in

Right. I have an Alienware laptop that contains a P4 3.06Ghz and I get about 1hr of battery life (MAX), but I have friends that have the Centrino that gets 3 or more hours of work.

what about the Intel ITANIUM 2 processor; compared to the pentium 4 its the same thing... what is that? im so confused with all this intel stuff.....

itanium 2 is barely based on x86. It is a 64bit server class processor that, if i remember the numbers correctly, is at times up to 15% faster than the Opteron at about 7 times the cost (and it can't do 32 bit except through emulation, which is EXTREMELY inefficient). the centrino is a chipset, not a processor. the centrino processor is a P4M that includes certain things like _intel_ 802.11b etc. and everyone knows what the P4 is. There are white papers on these kinds of things if you want to get down to the nitty gritty of the processor design and architecture as to why they do certain things like they do.