iMac Memory Upgrade

Discussion in 'iMac' started by nkonstas, Sep 14, 2011.

  1. nkonstas macrumors newbie

    nkonstas

    Joined:
    Oct 2, 2008
    #1
    Hi,

    Today I've upgraded the memory on my Mac from 4GB (2x2GB) to 8GB (2x4GB - link)

    I noticed that after about 20 mins of usage the disk I/O appear to get very slow. Admittedly this is only a guess on my part - but here's what I notice:

    - Applications that are already loaded respond fast - for example a page loaded on firefox scrolls smoothly - no perceived slowdown).

    - Anything that needs to do any kind of disk access is painfully slow - for example XCode appears to compile files about 5-10 times slower than normal.

    - CPU utilization for running applications is too high - for all of them

    - A VMWare Windows instance I run grounds to a halt

    - If I restart the machine it works fine for about 20mis and then the problems start again

    I've no idea why the memory upgrade would cause anything like that.
    Btw, I run Lion. If you need any kind of diagnostics dump just let me know.

    Any ideas? Should I reset/clear/delete anything following a memory upgrade?

    Cheers,
    Nikos.
     
  2. killerrobot macrumors 68020

    killerrobot

    Joined:
    Jun 7, 2007
    Location:
    127.0.0.1
    #2
  3. nkonstas thread starter macrumors newbie

    nkonstas

    Joined:
    Oct 2, 2008
    #3
    According to MacTracker:

    iMac 24-inch early 2008 model.
    Model identifier: iMac8,1

    I will try resetting the PRAM now.

    Cheers,
    Nikos.
     
  4. nkonstas thread starter macrumors newbie

    nkonstas

    Joined:
    Oct 2, 2008
    #4
    After reading this I downgraded the memory to 6GB and all seems to good now. Apparently the m/b doesn't support 8GB :(

    Cheers,
    Nikos.
     
  5. malias4 macrumors 6502

    malias4

    Joined:
    Jun 21, 2011
    Location:
    Greece and Holland
    #5
    Glad to hear everything worked out well :rolleyes:
    Γεια σου πατριδα :D
     

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