3rd-party RAM for nMP

Discussion in 'Mac Pro' started by SuperMatt, Mar 24, 2014.

  1. SuperMatt macrumors 6502

    SuperMatt

    Joined:
    Mar 28, 2002
    #1
    I saw this review of 2 different 64 GB RAM upgrades for the nMP. It includes benchmarks, so I thought it might be of interest to those frequenting this forum.

    http://www.tekrevue.com/2013-mac-pro-ram-upgrade/
     
  2. Stephent macrumors member

    Joined:
    Jan 31, 2012
    #2
  3. RoastingPig, Mar 24, 2014
    Last edited: Mar 25, 2014
  4. albert1028 macrumors 6502

    Joined:
    Jun 29, 2007
    #4
    Using the same one, decided to go with 48gb (3x16gb of DDR3-1866) since it's fastest if you don't need the full 64gb.
     
  5. Stephent macrumors member

    Joined:
    Jan 31, 2012
    #5
    Only problem with that is that you can't go to 64GB if you want late without buying 4 new sticks. It is recommended that all the 16GB sticks come from the same lot. Just an fyi if you were not await of that.
     
  6. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #6
    You don't need to worry about that if the modules have the same specifications. As long as they have the same voltage and are of the same type (unbuffered/registered) they are likely to work together, although generally the more difference they have the less-optimal performance will be.

    RAM kits using only identical DIMMs from the same vendor's production run only starts to matter when you are overclocking memory. It should not be an issue at all with workstations, thats why we have specifications.
     
  7. Stephent macrumors member

    Joined:
    Jan 31, 2012
    #7
    I'm just repeating what has been recommended. If I am spending that much money on RAM I wouldn't want to take the chance. Especially if I'm already ordering three sticks.
     
  8. ChuckBlack macrumors member

    ChuckBlack

    Joined:
    Jul 5, 2010
    #8
    I'm looking at only going to 32GB of RAM for my nMac Pro when it arrives. That Hynix RAM seems like a great deal. I'm just wondering what would be better performance wise. 4x8GB or 2x16GB? There is mention of possibly taking a performance hit if I went with 2x16GB now and added another 2x 16GB in the future. Is that a huge worry? I'm leaning towards the 2x 16GB.

    Thanks!
     
  9. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #9
    Go with the 2x 16GiB.

    The Xeon E5-xxxx v2 CPUs have huge L3 caches. Most apps mostly fit in the caches, and don't see significant performance hits even with a single DIMM configuration.

    If you want to look at some data that supports this opinion, read http://forums.macrumors.com/showthread.php?t=1704700 start to finish.

    If money were not a consideration, go with the 4x8 and throw them away when you upgrade. For me - I buy systems with 24 DIMM slots and always buy DIMMs in multiples of 8 to populate all channels.
     
  10. ChuckBlack, Mar 27, 2014
    Last edited: Mar 27, 2014

    ChuckBlack macrumors member

    ChuckBlack

    Joined:
    Jul 5, 2010
    #10
    Thanks for the link! Very informative. I think I'll go with the 4x8GB as I'm just a hobbyist that doesn't really need 64GB, I just wanted to be more future-proof by leaving two slots open. The difference in the multicore score with 2 banks filled vs 4 banks tips the scales for me. I'm planning on selling this machine in 2.5 years before Apple Care gives out anyway.
     
  11. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #11
    The real takeaway from those tests is that only two programs (one of them a synthetic benchmark that does no useful work) had large performance boosts from more DIMMs. If you pull those two out of the averages, the performance is virtually the same regardless of the number of DIMMs.
     
  12. iPadPublisher macrumors 6502

    Joined:
    Apr 14, 2010
    #12
    FWIW running 64GB of the Crucial, picked it up from Amazon, and its been fine for the first week I've had the machine.
     

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