Faster RAM works okay in Nehalem Mac Pro

Discussion in 'Mac Pro' started by KD7IWP, Nov 11, 2010.

  1. KD7IWP macrumors 6502a

    KD7IWP

    Joined:
    Mar 8, 2004
    Location:
    American living in Canada
    #1
    Just a note for anyone else out there who wants to upgrade the RAM in their Nehalem Mac Pro, faster RAM will correctly clock down to the 1066Mhz that our systems run at. The 1066Mhz RAM is often more expensive than 1333Mhz RAM and after extensive searching with Google I couldn't find any other posts of people who had tried the RAM out. So I thought I'd be a guinea pig.

    I put 2 Kingston ValueRAM 2GB sticks in my Quad Core 2.66Ghz Mac Pro (2009) along with 2 of the original 1GB sticks and the system is running much better now with the 6GB of RAM. For a $70 upgrade, not bad.
     
  2. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #2
    All 2010 systems actually come with 1333MHz memory and Apple note in their manual that only 1333MHz is supported, but will be down clocked.

    All DDR3 240 pin memory should work really. 16GB DIMMs are the only ones that seem to be untested.
     
  3. degl macrumors member

    degl

    Joined:
    Jun 12, 2010
    Location:
    Caracas
  4. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #4
  5. karsten macrumors 6502a

    karsten

    Joined:
    Sep 3, 2010
  6. toxic macrumors 68000

    Joined:
    Nov 9, 2008
    #6
    nope. the trouble is not all non-ECC RAM works...I tried Mushkin Silverline 1333, which didn't work, and now I'm using Crucial 1066, which do, in an '09 MP.
     
  7. degl macrumors member

    degl

    Joined:
    Jun 12, 2010
    Location:
    Caracas
    #7
    Which model is you Kingston Ram?

    Tanks
     
  8. bearcatrp macrumors 68000

    Joined:
    Sep 24, 2008
    Location:
    Boon Docks USA
    #8
    If your mixing ram of different speed, it will always run at the slower speed. Try removing the slower ram and see what happens. It will probably drop to 1066 or may lock up.
     

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