20% faster at same clock speeds !?!

Discussion in 'Mac Basics and Help' started by irishgrizzly, Jun 20, 2006.

  1. irishgrizzly macrumors 65816

    irishgrizzly

    Joined:
    May 15, 2006
    #1
    I've been reading the menron thread over in buying tips. I came across the line "I thought it was 20% faster at same clock speeds".

    Now I've never paid much attention to clock speeds and Mhz numbers. But this confuses me. I've heard that it is not longer about clock speeds as people keep saying here. But how do you define the speed of a machine against another in numbers (without putting both through benchmark tests).

    Can anyone explain this in layman's terms? I know two core are better then one, does this make a 2 core 1.8Mhz equal to a single core 3.6Mhz? :confused:
     
  2. topgunn macrumors 65816

    topgunn

    Joined:
    Nov 5, 2004
    Location:
    Texas
    #2
    It means that it can complete 20% more work units at the same clock speed. This is a theoretical figure released by Intel. Basically, the Merom is the same processor as the Core Duo but it has added instruction sets as well as 64-bit capabilities.

    And no, a 1.8GHz dual core CPU does not equal a single core 3.6GHz. A program has to be able to support multiple processors. If it doesn't, it will just use one. Now, if the OS is smart enough, it can have two applications that don't support multiple processors and run them each on a different core. For more information, read the guide here.
     
  3. BlizzardBomb macrumors 68030

    BlizzardBomb

    Joined:
    Jun 15, 2005
    Location:
    England
    #3
    The easiest way is to look at how modern the chip is. Pentium 4 will be outperformed by a Core Duo (even at a lower clock speed) and the Core 2 Duo will outperform a Core Duo at the same clock speed.

    Sadly not, as there are inefficiencies. If it were true the Quad Power Mac would be running at 10GHz :eek: :D
     
  4. dpaanlka macrumors 601

    dpaanlka

    Joined:
    Nov 16, 2004
    Location:
    Illinois
    #4
    When the 9500 and 9600 multiprocessor Macs were released, how did Mac OS 7 handle this? Was it smart enough to juggle processors? I know there is a multiprocessing extension for the operating system. What does it do?
     
  5. velocityg4 macrumors 68040

    velocityg4

    Joined:
    Dec 19, 2004
    Location:
    Georgia
    #5
    Basically it used only one processor most of the time. Though some programs like photoshop were able to use all processors. I just don't understand why these machines were not supported in Mac OS X. Since a dual 300mhz 604e had to outperform a single 233mhz G3 iMac.
     
  6. MacDonaldsd macrumors 65816

    MacDonaldsd

    Joined:
    Sep 8, 2005
    Location:
    London , UK
    #6
    I think that a dual core 1.8 ghz has a 50% in real time increase other a single core, so a 2.7 GHz. (im sure i read that some where) like mentioned above the os and applications have to take advantage of this and it still carried out over the same bus.
     

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