Why we need 2 processor?

Discussion in 'MacBook Pro' started by feyn-man, Nov 26, 2007.

  1. feyn-man macrumors regular

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    Oct 24, 2007
    #1
    Does it really needed?
    How much improvement of the performance?
     
  2. noodle654 macrumors 68020

    noodle654

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    Never Ender
    #2
    I have no clue what you are asking so I will give it a shot.

    Are you asking what is the difference in lets say PowerPC G4 compared to Intel Core 2 Duo?

    A G4 processor is just one processor on a single chip.

    Intel Core 2 Duo is 2 processing cores on a single chip, so you have 2 processors in 1.

    The speed difference is quite large.

    The fastest PowerBook was at 1.67Ghz G4 wise.
    Right now the fastest MacBook Pro is 2.6GHz. So (correct me if I am wrong) you have 2.6GHz x 2= 5.2GHz of speed. I might be wrong on this, I might need some correction here.
     
  3. Hoopdy macrumors 6502

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    Sep 13, 2007
    #3
    You will definitely see a performance boost with the Core2Duo's over an old school pentium.

    It's not actually two processors, it's 2 chips on one dye.
     
  4. feyn-man thread starter macrumors regular

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    Oct 24, 2007
    #4
    What I mean is that:

    I have seen in the forum that somebody turn off another processor's working to solve the macbook buzz issue. So I wonder if the performance is the same, why we need two?
     
  5. noodle654 macrumors 68020

    noodle654

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    #5
    Turn off your processor?? I dont think so. I don't see how that would help the buzz issue at all. Performance with 2 I am guessing is much better than one.
     
  6. Pressure macrumors 68040

    Pressure

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    #6
    Just because you have two cores on a single package does not make it go faster than their separate speed. What it gives you, however, is much better performance with software that is multithreaded or if you are multitasking.
     
  7. feyn-man thread starter macrumors regular

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    Oct 24, 2007
    #7
  8. yellow Moderator emeritus

    yellow

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    Portland, OR
    #8
    Yes, you can turn off cores using the CHUD tools.
     
  9. blurb23 macrumors 6502a

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    Feb 25, 2007
    #9
    Not quite. You don't double the clock speed.

    For example, a quad core at 2.6Ghz isn't 4x2.6Ghz.
     
  10. Pressure macrumors 68040

    Pressure

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    #10
    Disabling one core will have an adverse effect on your battery life, because the remaining core will be denied to go into a lower power state.
     
  11. Eidorian macrumors Penryn

    Eidorian

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    Indianapolis
    #11
    Performance isn't the same with one processor.

    This isn't the first time where disabling a core is a workaround to buzzing.
     
  12. TheStu macrumors 65816

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    Carlisle, PA
    #12
    I believe that if you were to have a perfectly multi-threaded application, it would be able to accomplish the same amount of work on a 4*2Ghz processor as it would on a 1*8GHz processor.

    However, since the world is not perfect....
     
  13. Rotary8 macrumors regular

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    Oct 24, 2006
    #13
    Think of what it's like to run photoshop cs2 then going to cs3 on an intel machine. A huge difference imo.

    It's damn important for anyone working in 2D or 3D. Especially in 3D when more cpu's means quicker rendering.
     
  14. blurb23 macrumors 6502a

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    Feb 25, 2007
    #14
    Correct, at least that's what I understand.

    But as you said, things are not perfectly multi-threaded ;) Heck, a lot of things still aren't multi-threaded at all, let alone perfectly done.
     
  15. TheStranger55 macrumors member

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    Jul 26, 2007
    #15
    Running two processors will usually give you better performance than two. Some argue that if you use single-threaded apps it doesn't make a difference, but that isn't true since the OS is running plenty of applications and processes in the background so having another core to help handle those is better than disabling one core, which will result in less speed.
     
  16. heatmiser macrumors 68020

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    Dec 6, 2007
    #16
    Guy up there's right about the futility of dimming a processor. You can turn one core off with software, but it doesn't increase battery life. I tried it some time ago, and actually got slightly worse battery life (according to the timer) than I did with two cores. I also tried this back in the day on a Gateway, and had the same result. Bottom line: stick with both cores.
     
  17. philgilder macrumors 68000

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    Sep 30, 2007
    Location:
    UK
    #17
    one of the main reasons for doing two cores on one chip is heat
    single core processors (eg pentium 4s) got as fast as they could when air cooled (around 3.8GHz)

    the solution was to get two cores on one chip, which dont get as hot and are also more powerful
     

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