Mac pro 4.1 to 5.1 - RAM stays at 1066mhz

Discussion in 'Mac Pro' started by mistasparkaru, Apr 22, 2013.

  1. mistasparkaru macrumors newbie

    Joined:
    Apr 19, 2010
    #1
    I have just done the firmware update, I kept my original CPU a 2.66 Xeon but upgraded the ram to 16GB 1333mhz RAM

    OSX still recognizes the ram as 1066mhz

    I have held the internal reset button down for a few seconds with the plug out but its still the same.
     
  2. Inconsequential macrumors 68000

    Joined:
    Sep 12, 2007
    #2
    The W3520 does not support 1333MHz memory.

    So unless you upgrade the CPU, it won't change.
     
  3. mistasparkaru thread starter macrumors newbie

    Joined:
    Apr 19, 2010
  4. applegeek897 macrumors regular

    Joined:
    Aug 23, 2011
    #4
    Yea i was also confused when i upgraded my ram.
     
  5. Mac Hammer Fan macrumors 6502a

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
    #5
    If you flash the firmware 4,1>5,1 and replace your CPU by an intel W3680 (Hex Westmere), your RAM will be recognized as 1333 MHz. This upgrade is easy, thanks to the clear instructions of philipma1957 here:
    http://forums.macrumors.com/showthread.php?t=1122551
    Highly recommended.
     
  6. Inconsequential macrumors 68000

    Joined:
    Sep 12, 2007
    #6
    ... or the W3580,
    or W3670...

    :p
     
  7. Mac Hammer Fan macrumors 6502a

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
    #7
  8. Inconsequential macrumors 68000

    Joined:
    Sep 12, 2007
    #8
    Single threaded performance is the same for the w3580, so if you find one for a stonking price then it might be worth it over the w3680.
     
  9. MyMac1976 macrumors 6502

    MyMac1976

    Joined:
    Apr 14, 2013

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