More memory for the Quad Mac Pro (4GB DIMMS)

Discussion in 'Mac Pro' started by VirtualRain, Mar 11, 2009.

  1. VirtualRain macrumors 603

    VirtualRain

    Joined:
    Aug 1, 2008
    Location:
    Vancouver, BC
    #1
    What kind of memory does the 3540/3520 Quad Mac Pro support?

    Will it work with these Kingston Registered ECC dimms?
    http://shop.kingston.com/PartsInfo.asp?ktcpartno=KVR1066D3Q8R7SK2/8G

    If not, are there others that will work at this time?

    Is the 8GB memory limit on the Quad's thought to be due to DIMM capacity (e.g. attributable to readily available 2GB DIMMS) or some limit on the memory controller?
     
  2. canonballs macrumors member

    Joined:
    Mar 8, 2009
    #2
    As per Apple's guide, it takes unbuffered as opposed to registered dimms.
     
  3. VirtualRain thread starter macrumors 603

    VirtualRain

    Joined:
    Aug 1, 2008
    Location:
    Vancouver, BC
    #3
    Thanks, I didn't realize that registered=buffered. One of the benefits of this platform is the support for unbuffered RAM. :)
     
  4. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #4
    Any limit would be due to Apple marketing. The technology supports DDR3 PC3-8500 1066MHz memory in either Unbuffered non-ECC, Unbuffered ECC or Registered ECC.
     
  5. eelmac macrumors member

    Joined:
    Mar 9, 2009
  6. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #6
    From what I can tell, it's a result of parts availability.

    The 1066MHz Unbuffered they're using is CL = 7. Apparently nothing greater than 1GB or 2GB sticks available ATM. This should change shortly however. ;)

    The only 4GB DIMM's I know are available, are Registered (1066MHz @ CL = 7). Offered for $200/DIMM from (here from Crucial).

    Other CAS latencies could likely be used, as it's supported in the JEDEC spec, and by Intel. Even the 1333MHz variety on the 2.66GHz or above Octo models (X5550 & X5570), but CL = 9 in this case. Though I think either is actually possible, both higher latencies and clock speeds are untested on the '09 MP AFIAK.
    See above. ;)
     
  7. VirtualRain thread starter macrumors 603

    VirtualRain

    Joined:
    Aug 1, 2008
    Location:
    Vancouver, BC
    #9
  8. Bartolini macrumors newbie

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    Oct 16, 2009
    #10
  9. Transporteur macrumors 68030

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    Nov 30, 2008
    Location:
    UK
    #11
  10. Bartolini macrumors newbie

    Joined:
    Oct 16, 2009
    #12
    Thx;)
     

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