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  1. #1
    SitePoint Enthusiast zeedoo's Avatar
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    Difference between Pentium M & Pentium 4 Processor ?

    Ok, I am no pro, that you would have judged from the title ...
    I am looking for a notebook and i see two Pentium options ... Pentium 4 with like 3.0+ Ghz speeds and another Pentium M which has speeds like 1.7 or less ...

    now my question, how do both compare ... I mean is P4 3.2 ~= PM 1.7 speed/performance wise ... if not then why they charging so high for it ???

  2. #2
    ..back with a vengeance... Ingoal's Avatar
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    The pentium M is the central part of Intel's Centrino technology. The pure GHz speed doesn't tell the real performance with this processor...

    Apart from that the pentium M is a real notebook processor whereas the p4 is a desktop processor (if you didn't miss the "m"), so you gotta ask yourself whether or not the notebook is needed for true mobile use [~battery life(depending on battery size and power management): p4=1.5-4h; pM=4-8h]...

    Check Intel pdf for some benchmarks between "old" pentium M (1MB Cache) new pentium M (2MB Cache) [both 1.7GHz] and a pentium 4M 2.6GHz...
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  3. #3
    Serial Publisher silver trophy aspen's Avatar
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    pentium M is great. My Dell laptop can go for 10 hours.
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  4. #4
    Put your best practices away. The New Guy's Avatar
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    Thats amazing.
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  5. #5
    SitePoint Enthusiast zeedoo's Avatar
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    ok ... but how does the speed differ ... i need a very fast system and decently mobile ...

    which one would you prefer?

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    ..back with a vengeance... Ingoal's Avatar
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    Quote Originally Posted by zeedoo
    ok ... but how does the speed differ ... i need a very fast system and decently mobile ...

    which one would you prefer?
    Well, if you have a look at the pdf which i linked to (pages 15 and following) you'll see that the Pentium M is well powerful and that with superior battery runtime...so I would say to the Pentium M...

    (Depending on the application you're using you might wanna think about not going centrino (which is the intel setup consisting of: cpu (pentium m), video card (shared) and wifi-card) but pentium m (cpu = pentium m, but video card = ati or nvidia) )

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  7. #7
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    what is the difference between a Pentium 4M and a Pentium 4?

  8. #8
    ..back with a vengeance... Ingoal's Avatar
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    Quote Originally Posted by hehehe
    what is the difference between a Pentium 4M and a Pentium 4?
    The Pentium 4m (m = mobile) is the mobile edition of the P4 which is operating with a lower voltage hence less power consumption and less heat...the p4 is just the "normal" desktop cpu...

    Ingo
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  9. #9
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    i see.....so 4M is just a bit slower but uses less voltage

  10. #10
    SitePoint Guru SteveO's Avatar
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    My Dell laptop has Centrino which, I think, means that it runs at a different speed depending if you are plugged into the mains electricity so when its running on battery it is running slower and using less power.

  11. #11
    ..back with a vengeance... Ingoal's Avatar
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    Quote Originally Posted by hehehe
    i see.....so 4M is just a bit slower but uses less voltage
    Well...not really slower, just consuming less power and hence producing less heat (a p4m 2.6GHz has got the same performance as a p4 2.6GHz )...

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  12. #12
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    but more expensive..right?

  13. #13
    ..back with a vengeance... Ingoal's Avatar
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    Quote Originally Posted by hehehe
    but more expensive..right?
    Yup...although more expensive is relative...usually p4m setups cost around the same as a p4 setup (although the p4 setups usually have more stuff to it, i.e. dvd-rw instead of dvd/cd-rw-combo...)...but true, the processor itself is generally more expensive...
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  14. #14
    differently saned russbellon's Avatar
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    they have different cores, besides the power consumption issue. the Pentium Ms have a much higher IPC (they do more in less cycles) then the P4s
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  15. #15
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    yes, i agree, PM is better than P4 because PM is specially designed for laptop, which produces lower working temperture during working.


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