Mid 2010 iMac 11,3 i3 RAM upgrade problem

Discussion in 'iMac' started by Canuckfu, May 23, 2013.

  1. Canuckfu macrumors newbie

    Jan 28, 2012
    I know there are many threads on this but it seems like people can't agree on how apple and intel define channels and banks etc. It also seems like what is reported as capable is different than what is actually achievable.

    I've tried upgrading my ram from the 2x2GB samsung but have had nothing but instability issues. I currently have

    2x2GB samsung
    2x4GB corsair
    2x8GB corsair

    No matter the configuration I try I run into issues (except going back to the 2x2GB that it came installed with)

    I currently have the 2x8GB in the 2 top slots (those being the 2 slots closest to the monitor) and 2x2GB in the 2 bottom slots (those being the 2 slots closest to the stand). They system recognizes the 20GB installed but shutsdown when I try to run some programs or render graphics etc.

    My first question is what is the correct configuration out of the 6 possibilities (assuming I want to max out at 24GB):

    Config 1
    Top slots: 8x8
    Bot Slots: 4x4

    Config 2
    Top slots: 4x4
    Bot Slots: 8x8

    Config 3
    Top slots: 8x4
    Bot Slots: 8x4

    Config 4
    Top slots: 4x8
    Bot Slots: 4x8

    Config 5
    Top slots: 8x4
    Bot Slots: 4x8

    Config 6
    Top slots: 4x8
    Bot Slots: 8x4

    At this point I am not interested in learning about dual channel and banks and dimms. I'll learn the why later. Just want to get back to a stable system and need to to know that "what to do" at this point.

    Help is appreciated
  2. Canuckfu thread starter macrumors newbie

    Jan 28, 2012
    is part of my problem possibly due to the i3 CPU?

    I can get the computer to start up when I install 2x4GB and 2x2GB as well as 2x8GB and 2x2GB but not when I install 2x4GB and 2x8GB. However, the neither of the first 2 configuration are stable. That is, if I start doing something even remotely RAM intensive the computer restarts.
  3. justperry macrumors G3


    Aug 10, 2007
    In the core of a black hole.
    You should run Memtest on the 2 x 4 GB and 2 X 8 Gb configurations, they are both Corsair, plenty of problems with them.

    Go to the link below, down load Memtest and while you are there click on the Guide, it will download a Guide (Text file), read it and then run Memtest in Single User Mode, if there are any Errors send the RAM back and get different RAM, Crucial is one of the one which has little problems, Macs can be picky with RAM.


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