Dual Processor vs Dual Core

Discussion in 'PowerPC Macs' started by MatthewLTL, Mar 8, 2015.

  1. MatthewLTL macrumors 68000

    MatthewLTL

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    #1
    Since I have my DP 1.25 coming for my MDD and knowing that the G5 was in both DP and DC it got me thinking....

    With PowerMacs (Specifically the G5) What has better preformance? A Dual Processor Single Core G5 or a Single processor Dual Core G5?

    Now i know all the process or Dual Core vs DP with Windows Servers but since DP PowerMac (the G4s anyway) dont have 2 RAM channels like DP PCs do i assume the PowerPC DP/DC setup is different
     
  2. Intell macrumors P6

    Intell

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    #2
    The dual cores often perform better at the same clock speed.
     
  3. redheeler macrumors 603

    redheeler

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    #3
    They also consume less power.
     
  4. Anonymous Freak macrumors 601

    Anonymous Freak

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    #4
    It largely depends on the workload. If you're doing something that isn't bandwidth intensive, and is similar enough that it has multiple threads doing similar work on the same data, then dual-core will be better.

    If you're doing something that is bandwidth intensive, and sends noticeably different data to multiple threads, then dual-socket would be better.

    Dual-core shares a single socket for two threads, where dual-socket is separate - so dual-socket has more bandwidth available per core than dual-core.

    (Although, admittedly, if you're that concerned about ultra-high-performance, you would be looking at something more modern than a G5... Even a previous-gen quad-core Mac mini would outperform any two-total-cores G5, and be very competitive to the quad-core G5.)
     
  5. bunnspecial macrumors 603

    bunnspecial

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    #5
    One additional advantage of the DC G5s is that they use faster memory than the dual processor ones.
     
  6. redheeler macrumors 603

    redheeler

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    #6
    Even a dual-core 2012 Mac mini would outperform the best quad-core G5 no problem.
     
  7. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #7

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  8. gavinstubbs09, Mar 8, 2015
    Last edited: Mar 8, 2015

    gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #8
    The Early 2005 2.7 had a 650w power supply while all DC models feature a 710w power supply hence the stupid power cable specific to that model.
     

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  9. bax2003 macrumors 6502a

    bax2003

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    #9
    Of course it is faster on CPU benchmark when that DP model is 300 MHz faster per CPU.
     
  10. desantii macrumors 6502

    desantii

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    #10
    The DP in this case is 15% faster frequency wise but only 8% faster in Geekbench, so actually either scaling is not linear or the DC actually is performing better

    Were't the DCs an updated version of the base G5 (e.g. some improvements in IPC)

     
  11. Surrat macrumors 6502

    Surrat

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    #11
    Dont forget that besides faster memory, and pci express, the dual core G5's also had double the L2 cache of the older versions.
     
  12. desantii macrumors 6502

    desantii

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    #12
    Exactly...the later G5s (DC) should have some IPC improvements from the previous ones (DP) from the cache, other tweaks?, faster components

     
  13. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #13
    Absolutely. I'm stating that the DC regardless of speed doesn't offer much over the DP.
     

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