09 octad .. ram optimal configuration question

Discussion in 'Mac Pro' started by jetjaguar, Feb 19, 2010.

  1. jetjaguar macrumors 68030

    jetjaguar

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    #1
    im looking at moving up to 16gb of ram in the near future .. originally i was planning on going with 8x2gb sticks .. is this optimal or is there a better way to do and keep triple channel .. currently have 6x1gb sticks:confused:
     
  2. dazey macrumors 6502

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    Dec 9, 2005
    #2
    Try looking over at barefeats.com I believe their conclusion was that optimal is to keep the 2 pairs of 3 and not fill up the last two slots (so you would be better off with 3x4GB, 3x2GB). My memory is not infallible though so have a look for their research
     
  3. Umbongo macrumors 601

    Umbongo

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    #3
    You can even go 4,4,4, & 2,1,1 if you like, but you may not even notice any real difference between the maximum bandwidth of a triple channel setup and that of the dual channel interleave you get with 8 slots filled.
     
  4. CCK macrumors member

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    Feb 14, 2010
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    KY
    #4
    When I was looking at getting an 09 this was a concern to me and if it's the same with the 2010's... Is this just OWC ram that there *special note refers to?

    *Special note-
    4GB Module sets require that all installed modules be of the same kind OWC 4GB module (p/n OWC8566D3MPE4GB).
     
  5. Cynicalone macrumors 68040

    Cynicalone

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    #5
    To keep triple channel you would need to go with 4GB modules in 6 slots. Or 2GB modules in 6 slots. Or mix the pairs to get to 16GB. You get the idea. Just keep it to 3 Pairs in 6 slots.

    Something like two pairs of 2GB sticks with a pair of 4GB sticks will give you 16GB in triple channel configuration.
     
  6. jetjaguar thread starter macrumors 68030

    jetjaguar

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  7. Umbongo macrumors 601

    Umbongo

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    #7
    Fill it with 2GB DIMMs and don't worry about it.
     
  8. Techhie macrumors 65816

    Techhie

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    #8
    The bottom line: there is almost no benefit to using a triple channel config vs. dual. Fill up the slots, it will be cheaper and give you more memory/options.
     
  9. lemonade-maker macrumors 6502

    lemonade-maker

    Joined:
    Jun 20, 2009
    #9
    Yup. Or 4GB ones.
     

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