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How fast is a Celeron M vs a Pentium M/Centrino and a Pentium 4?

It will have disadvantages for cache-intensive applications, which is often minor. Obviously most currently produced have low clockspeed.

The main disadvantage is not speed but less suphisticated power management. You can't expect the same battery life than from a Pentium-M.
 
Celeron M suffers from power management as the cpu does not throttle down. It's this throttling action that allows Pentium-M's to get incredible overall battery life and on many systems the cpu fan rarely needs to go on except when the cpu is being pushed hard. Since the Celeron-M does not throttle, it uses more overall power and gets more hot which in turn means your cpu fan needs to kick on more often.
 
If its a Willamette running at 1.3 or 1.4 Ghz then it's a dog. You sure it isn't a Pentium M with only 512k cache vs 2 gig for the Centrino?
 
Celerys in general are just plain crap, and shouldn't even be recommended... The P4Ms especially the Dothan cores have higher clock and better performance and do come with 2 MB of cache
 
The celeron isnt a bad chip if you want a low end machine for web browsing and word, or if its going to be your tivo machine
 
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