Allocating the ram on risers

Discussion in 'Mac Pro' started by kitki83, May 13, 2007.

  1. kitki83 macrumors 6502a

    Mar 31, 2004
    Los Angeles
    Ok, I was able to place the ram in Riser A which was 2x1gig and 2x512mb. Thats a total of 3 gigs worked fine under Mac os X but under windows XP it would recognize 2 gigs. Does anyone know how to allocated my memory to give the best performance.
  2. robbieduncan Moderator emeritus


    Jul 24, 2002
    For maximum performance you want to use slots 1&2 on Riser A, then slots 1&2 on Riser B followed by slots 3&4 on A then B.

    You may need to use a boot switch to get XP to recognise more than 2Gb of RAM, although I'm not sure.
  3. techster85 macrumors regular

    Oct 17, 2006
    Lubbock, TX
    wait so you put ALL your ram on one riser? I'm surprised it worked very well at all since Apple makes it pretty clear to keep the ram separated if possible (ie. 2 gigs on one riser, 1 gig on the other) Also, I put my ram in with the larger Dimms on the first riser and the smaller on the second, I don't know if it really makes a difference or not...but it might?
  4. dr01dy macrumors member

    May 3, 2007

    I just got my mac pro today and that is what I did and everything worked out fine.

    2 x 1gig on A 1 &2
    2 x 512 on B 1 & 2

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