Reading the title, you might be tempted to post without reading what
I'm saying here, but please don't.
I'm looking into this matter for a friend who wants a cheapish laptop
for light usage. Obviously, performance isn't too important but things
like price, weight, and battery life are. I have a good idea on advice
based on my research but one thing I'm still not certain on is the
battery life / power usage of the Celeron M vs Athlon XP & Sempron M.
Originally, I thought the Celeron M would win no contest, I know the
Pentium M will. But then when I looked into the Celeron M I quickly
realised it wasn't just the reduced cache and clock speed, the Celeron
M also lacked Enhanced Speedstep and "Deeper Sleep".
Realising this, I've become a lot less certain. For those of you who
don't understand, although the Celeron M still has a number of the
power saving features of the Pentium M design, the lack of Enhanced
Speestep is quite significiant. The 'deeper sleep' is also somewhat
important I suspect as I understand it can result in up to 30% power
savings over normal 'sleep'. As all (to my knowledge) mobile Athlon
based processors have Power Now!, this means the AMD based laptops
will be reducing their clock speed (and power usage) under low load
whereas the Celeron M will always be at full speed (although obviously
will be able to go into sleep states). I suspect under high load and
if you force the AMD based systems to always operate at full speed,
they will def lose to Celeron M systems, especially given that the
Celeron M have a TDP of 21w whereas lower voltage AMD based systems
tend to be 25w but this seems unlikely to be the case in low load
systems. I suspect it's going to depend a lot on the load. If the
Celeron M is able to enter sleep states a lot but clock speed cannot
be reduced much for whatever reason, then the AMD based ones won't
Therefore, I would like feedback, with regard to the power usage or
battery life of a AMD based laptop (25w TDP or lower if that exists)
to a Celeron M (not a ultra low voltage one tho). Preferbly from
people who have tested this. Either via battery life of comparable
batteries or if they actually tested the power usage under low load.
Please do mention speeds, processor TDP if known, L2 cache size and
also core type if known (for Celeron M either Banias or Dothan
although I should be able to work out with other details). However,
those who have compared Celeron M and Pentium M systems (with other
comparable specs) under low load are also welcome as this should give
P.S. If your a Intel/AMD fanboy and have nothing constructive to add,
please don't bother to post.