Early '08 - RAM config with 4GB modules

Discussion in 'Mac Pro' started by lannister80, Oct 15, 2009.

  1. lannister80 macrumors 6502

    lannister80

    Joined:
    Apr 7, 2009
    Location:
    Chicagoland
    #1
    I'm thinking about grabbing some 4GB modules for my Early 08 Mac Pro. Is this the config I should set them up in?
    (and yes, I've looked at the RAM config guide everyone knows about, but it doesn't include 4GB modules)

    Riser A (top)
    4GB
    4GB
    2GB
    2GB

    Riser B (bottom)
    2GB
    2GB
    1GB
    1GB

    The only reason I ask is that I didn't know if it was better to have the 2GB pairs matches against each other in the riser slots (across cards) to get full interleaving. So another config would be:

    Riser A (top)
    2GB
    2GB
    4GB
    4GB

    Riser B (bottom)
    2GB
    2GB
    1GB
    1GB

    or

    Riser A (top)
    4GB
    4GB
    2GB
    2GB

    Riser B (bottom)
    1GB
    1GB
    2GB
    2GB

    Thanks!! :)
     
  2. Tesselator macrumors 601

    Tesselator

    Joined:
    Jan 9, 2008
    Location:
    Japan
    #2
    Just use the logic of the guide. Pretend your fours are twos and your twos are ones, etc.
     
  3. gugucom macrumors 68020

    gugucom

    Joined:
    May 21, 2009
    Location:
    Munich, Germany
    #3
    This would be difficult because he has only two 4GB modules. I would suggest the following:


    Riser A (top)
    1 - 4GB
    2 - 4GB
    3 - 1GB
    4 - 1GB

    Riser B (bottom)
    1 - 2GB
    2 - 2GB
    3 - 2GB
    4 - 2GB
     
  4. lannister80 thread starter macrumors 6502

    lannister80

    Joined:
    Apr 7, 2009
    Location:
    Chicagoland
    #4
    Yep, that looks right to me. I realized that if I divided all the values of my modules in half that they would match "9A" on the RAM chart we all know and love. And that is exactly gugucom recommended.

    Thank you!
     

Share This Page