Resolved Power Mac G5 - Trying to find the right RAM configuration

Discussion in 'PowerPC Macs' started by LOLZpersonok, May 28, 2018.

  1. LOLZpersonok, May 28, 2018
    Last edited: May 28, 2018

    LOLZpersonok macrumors 6502a


    Aug 10, 2012
    Calgary, Canada
    I recently grabbed a Power Mac G5, and I got it with 4.5GB of RAM: two 1GB modules, two 256MB modules and four 512MB modules.

    I'm trying to upgrade it just for fun. I can swap three modules: replace the 256MB modules with 512MB modules and one 512MB module with one 1GB module. With this configuration, it'd be three 1GB modules and five 512MB modules.

    It's my understanding that the modules need to be installed in pairs, but so far, every configuration of memory modules I tried has yielded no success. First, it dropped to 3GB of RAM, then 1GB and every one in between. I'm swapping the modules between slots to figure out which is correct.

    I've also found a diagram online that displays the identifiers for the RAM slots, so I'm trying to match them up. Can someone help me out? Can I even do three 1GB modules?
  2. AphoticD macrumors 68000


    Feb 17, 2017
    If the machine has 8 slots then you match from center out.

    So counting from the top slot, match the letters A, B, C and D;

    1 - D
    2 - C
    3 - B
    4 - A - start here

    5 - A
    6 - B
    7 - C
    8 - D

    Does that make sense?

    Make sure the RAM is both a match in size and speed e.g CL2.5, etc
    --- Post Merged, May 28, 2018 ---
    No, but you could use two of them or buy another one to have four.
  3. LOLZpersonok thread starter macrumors 6502a


    Aug 10, 2012
    Calgary, Canada
    I already found a diagram of the slot identification, and after a bit more testing, I figured that it probably does have to be either two 1GB modules or four, so I just replaced the two 256MB modules with two 512MB modules. 5GB isn't very mentally satisfying, but it's better than 4.5GB. Thanks for the help.

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