Mac Pro memory

Discussion in 'Mac Pro' started by macmaniac01, Mar 13, 2008.

  1. macmaniac01 macrumors newbie

    Joined:
    Mar 9, 2008
    #1
    can anyone tell me if the new mac pro's are able to use/run normal DDR2 RAM chips? Do I have use only FB-DIMM chips?

    I realise the FB means "Fully Buffered" and allows for read and write simultaneously to RAM. But i wounder if more RAM (DDR2) is better than less(FB-DIMM).

    The price difference is huge at my local computer store and i wonder if upgarding (if possible) to more DDR2 RAM chips instead of FB-DIMM is faster?
     
  2. MacFanBoyIIe macrumors 6502

    Joined:
    Feb 22, 2008
    #2
    It would REALLY behoove you to use the type of RAM that Apple certifies. You can get it on OWC.
     
  3. yeroen macrumors 6502a

    yeroen

    Joined:
    Mar 8, 2007
    Location:
    Cambridge, MA
    #3
    No, FB-DIMM's and standard DDR-2 modules require completely different wiring on the motherboard.

    In a standard DDR setup, wires run in parallel from each DDR module to the memory controller. FB-DIMM's contain DDR chips on the memory module, but access to/from the memory controller is mediated by the AMB chip through a serial interface. One of the rationales for this is that as you add more and more memory to the system, designing a parallel bus wiring layout becomes a much more difficult and expensive task.

    Intel has a good picture of this here (scroll down to the improving board layouts sub-section):
    http://www.intel.com/technology/magazine/computing/Fully-buffered-DIMM-0305.htm
     
  4. MacFanBoyIIe macrumors 6502

    Joined:
    Feb 22, 2008
    #4
    And then there's the whole heat sink thing.... Just get the certified RAM from OWC. Lifetime replacement. You won't regret it.
     
  5. CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #5
    Sigh - Welcome to MacRumors,

    First step is to Search for answers before posting a new thread, (we covered this question as recently as yesterday) or look in the Guides section of the site (under the Guides tab at the top of this window)

    Hardware: Understanding Intel Mac RAM


    The answer to this and many other common questions can be found in the Guides.
     

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