PowerMac G5 Ram question

Discussion in 'Macintosh Computers' started by Albone, Oct 15, 2004.

  1. Albone macrumors regular

    Jul 22, 2003
    The info on this seems kinda sketchy...if I have a G5 with 2 banks of RAM slots (4 RAM slots in total), can I have one bank of 2 512MB RAM chips and 2 256MB RAM chips in the other bank?

    The only thing I know for sure, is that you need the exact same RAM chips to fill one bank.

  2. ChrisFromCanada macrumors 65816


    May 3, 2004
    Hamilton, Ontario (CANADA)
    Your plan looks fine to me. You couldn't do something like 3 - 512s or a 1Gig a 256Mb and 2 - 512s.
  3. tveric macrumors 6502

    Jun 23, 2003
    The config you asked about is exactly what I have - the 2 256s came stock and I added 2 512s (from Crucial). Works great.
  4. Blue Velvet Moderator emeritus

    Jul 4, 2004
    The G5 dual 2.5s must have the two banks mirrored, symmetrical.

    i.e. 1 x 512 + 1 x 256 in each bank, same order going outwards from the centre...
  5. Macmaniac macrumors 68040


    Correct, the G5's slots are not designed to work with 2 512s in the upper 2 slots while 2 256s are in the lower 2 slots. They have to match.
    Slot A-paired with D
    Slot B-Paired with C
    Slot C-Paired with B
    Slot D-paired with A
    Thats how slot situation works out in the G5.
  6. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
    I think I uploaded a picture of the pairing...


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