Good points about the M. But what I find in the “real world” usage of laptops in general is most people are typically running one application at a time, email, or word processing, etc., and this means the CPU load is quite low all the time. Speedstep then can play a major role in battery life, which is exactly what it’s designed to do. You may be right that the battery life between the two models of the Sony is similar but I for one will be surprised if the 70 didn’t show significantly improved battery life in everyday mobile use.

the Celeron in the U50 has the same CPU-core as the Pentium in the U70. the difference in power consumption (if there really is one) is that the Pentium can do speedstep (to 600MHz) and the Celeron cannot. they are both Ultra Low Voltage Mobile prozessors. the difference should not be much.

maybe someone will run some tests under different loads. if you use the full CPU-power there should be no difference in battery life. under normal using conditions (lots of time with about 20% load or so) the speedstep of the U70 will kick in and probably save some battery. it’s hard to test though. you need a program that uses ‘typical’ amounts of CPU power. something that emulates normal use with peaks of 100% power and longer periods with 20% or so and some idle time in between.

I just wanted to say you cannot simply compare the ULV Celeron M 900 with an old Pentium. it’s no fair to the processor. this Celeron is almost the same as the ULV Pentium M, it has less L2 cach and it cannot do speedspep. that’s all the difference as far as I know. it has the same core architecture.

Idefix

I got a Compaq laptop last year and the Pentium M processor provides at least a 30% battery life increase over my previous laptop without the M. It’s significant for a mobile device like this.

http://videos.serve-me.com/u70penglish.WMV