G4 Dual 867 faster than G5 1.8?

Discussion in 'Macintosh Computers' started by Nermal, Sep 30, 2003.

  1. Moderator


    Staff Member

    Dec 7, 2002
    Whakatane, New Zealand
    Apple has given the 1.8 GHz G5 a Composite Theoretical Performance value of 21 753 (vs my 800 MHz iBook at 1064). But the Dual 867 G4 has a CTP of 23 409, which is higher than the G5! What do these CTP numbers actually mean anyway?

    For reference, the 2 GHz G5 has a CTP of 45 000.
  2. macrumors 604


    Sep 8, 2002
    The Netherlands

    Any idea what number this CTP value is?

    BTW. It is so that the Dual 1.25 (and thus the 1.42) G4's are indeed quicker than the Single G5's, in SMP conditions... So maybe this theoretical number does account for something.....
  3. Moderator emeritus

    Jun 25, 2002
    Gone but not forgotten.
    With those kinds of numbers, I would suspect some sort of single precision floating point calculations weighing heavily into the equation since AltiVec does that quite well.

    Since two G4 processors do that really well, it's no wonder that the 1.8 GHz G5 would be bested. Of course, if it was a matter of double precision floating point maths, the single G5 would probably win.

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