Mac Pro 2009 Memory Upgrade Question

Discussion in 'Mac Pro' started by Greenhoe, Jul 15, 2010.

  1. Greenhoe macrumors regular

    Dec 17, 2008
    Hi, I'm looking to upgrade my 2009 Mac Pro from 6 GB to 12 GB and I found on newegg "Crucial 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1066 (PC3 8500) Triple Channel Kit Desktop Memory Model CT3KIT25664BA1067"

    It seems like the best price for the money although it isn't under the Mac Memory section so I wanted to know if this would work with my Mac Pro. I would assume so since it seems as the same type of memory, but just isn't listed under the Mac Memory section on New egg.

  2. fearoftigers macrumors member

    Jan 21, 2010
    I also have a question about memory. Thought I better post it here otherwise the thread police will put a cap in my ass.

    How much memory can the 2009 quad core Mac Pro take?

    I've seen some memory sites saying you can put up to 32gb in it (and 64gb in the octo core) but according to the Apple store (and Crucial) the limit is 16gb for the quad and 32gb for the octo.

  3. Roman23 macrumors 6502

    Jun 12, 2010
    I can answer this before I goto sleep..

    As of current, the single-quad core mac pros can go as high as 32GB of memory, but since the 2009's take DDR3 or triple channel memory, its best to use threes instead of fours.. although in the end more memory is better, albeit a slower channel..

    Optimum for single-quads using ddr3 chips: 6GB(3x2GB), 12GB(3x4GB), and 24GB or 3x8GB(very expensive).. ANd very shortly when the 16GB ddr3 modules come out, then you will be able to go beyond 32GB.. 3x16GB = 48 or with 4 of those = 64.

    So, yes while you can use memory in twos or fours, it may not be optimum as ddr3 is different than ddr2. Your best bet is to access your needs and plan accordingly.. right now for my purposes, 6GB is fine, though I plan to goto 12GB.

    But, according to latest stats - 32GB is the max thus far.. a far cry from what apple says and they still deny 32GB for the single-quad and 64GB for the duals...

  4. costabunny macrumors 68020


    May 15, 2008
    Weymouth, UK
    just a note on this - DDR3 and dual/triple channel are NOT related.

    The Mac Pro uses a triple channel memory controller thats why three sticks should be more efficient than two or four.

    DDR3 can be used in dual channel systems such as iMac/MacBook/Mini and then is best in Pairs (2 or 4)

    - nitpicking I know.... :)
  5. Greenhoe thread starter macrumors regular

    Dec 17, 2008
    Does anyone know if that memory will work in a 2009 Mac Pro?
  6. WardC macrumors 68030


    Oct 17, 2007
    Fort Worth, TX
    With 8GB modules being as expensive as they are now, don't you think 16GB modules would be priced "out of this world" when they come out? To upgrade your single processor Mac Pro to 64GB or your dual machine to 128GB, you would be paying more for RAM than you paid for the machine itself!
  7. Roman23 macrumors 6502

    Jun 12, 2010
    It was just a theory..

    at this point, yes.. it would be a lot higher than the machine.. I was just stating this as a theory of possibly working in the single-quad.


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