I need help with potential Mac Pro RAM configs

Discussion in 'Mac Pro' started by NEENAHBOY, Jun 15, 2008.

  1. NEENAHBOY macrumors 6502

    Aug 15, 2004
    Arlington, VA
    Let me preface this by saying that I read the "Understanding Intel Mac RAM" guide, but it's either too vague or I'm just stupid (probably the latter), because I still don't fully get it. :eek:

    I plan on using the stock Apple RAM and a 4GB kit (don't think I need the power of the 8 kit just yet), probably from OWC. From what I've read, I think my particular configuration needs to be like this:

    Riser A
    2GB | 2GB | empty | empty

    Riser B
    1GB | 1GB | empty | empty

    With this, A1 and A2 are the same, as are B1 and B2. Is this a correct arrangement?

    Also, I get that full 256-bit access won't be available with this configuration. When the guide says there is a small speed benefit to doing this, just how small are we talking? Would it be worth it to just get four 2GB modules and stick the stock RAM in A3/A4?

    Thanks for your help, all.
  2. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
  3. hajime macrumors 601

    Jul 23, 2007
    I read that 1GBx2 are included with the MacPro. For a total of 10GB, which of the following configurations leads to the best performance?

    Option1. A1=A2=B1=B2= 2GB, A3=B3=1 GB
    Option2. A1=B1=4, A2=B2 = 1 GB
    Option3. Open to suggestions.

    In terms of performance, is it better to buy larger modules and use as few slots as possible? For a total of 12GB, what is the best configuration? Are there any rule of thumb?

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