RAM in late 09 and 2010 backwards compatible?

Discussion in 'iMac' started by pt0016, Jul 28, 2010.

  1. pt0016 macrumors regular

    pt0016

    Joined:
    Jul 9, 2010
    #1
    Can I use 1066MHz ram in the new 2010 iMacs, specified for 1333MHz? Are they backwards compatible?

    Cheers.
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
    You can but then the 1333MHz modules will underclock themselves to 1066MHz. I doubt you would notice any difference though
     
  3. pt0016 thread starter macrumors regular

    pt0016

    Joined:
    Jul 9, 2010
    #3
    Hmm, well in that case, I have 2x 1gb of 1066MHz DDR3 ram, from my other iMac I had.

    Would it be smart to upgrade to 6gb (4gb standard + 2gb) and underclock it to 1066MHz, or would it be better to have only 4gb of 1333MHz?

    Cheers
     
  4. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #4
    If you need more RAM, yes. The clock speed just increases the maximum bandwidth but 1066MHz is already pretty fast, most apps cannot take advantage of the extra speed. I would put it there
     

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