mixing ram

Discussion in 'Mac Pro' started by loungecorps, Oct 27, 2010.

  1. loungecorps macrumors member

    Aug 25, 2010
    Hey ya'll. So any way I plan on buying more ram soon. my mac pro 2010 quad 2.8 came with 1066 ram but I am buying 1333 ram (hex core in future) 4GB models

    I know that my new ram will be reduced to 1066 but will the new ram be able to coexist with the old 1GB modules?

    either way i'm buying the ram but I am curious
  2. neckarb macrumors regular

    Jun 29, 2007
    I'm mixing my RAM at the moment and I see no problems I'm sure that some people will say that it might impact performance microscopically, but realistically if you've got good RAM as long as it works in your machine mixing it shouldnt be a problem :)
  3. nanofrog macrumors G4

    May 6, 2008
    There are limitations.

    You cannot mix non-ECC, UDIMM (stock memory), or RDIMM (8GB sticks) with each other. The OEM memory that comes with the MP's are UDIMM, but according to OWC, the 4GB UDIMM modules don't work with the smaller capacity UDIMM's either (1 & 2GB sticks).

    So if you're going with 4GB sticks, they'd all need to be 4GB sticks (won't mix with the stock RAM < 1 or 2GB sticks>, in 1066 or 1333 flavors).
  4. tengo84 macrumors newbie

    Aug 2, 2010
    I bought this RAM (2 x 4GB) and mixed it with 2 sticks of my stock 1GB. Total of 10GB with no problems I'm aware of.
  5. silby101 macrumors member

    Jun 20, 2003
    Here is a good thread that talks about mixing RAM with my recent test of mixing 4Gb and 1Gb sticks,


    Also, I bought 2x4Gb ram from Newegg for only $165.99 USD and combined it with my stock 1Gb ram from apple for 10Gb at only a fraction of buying 12Gb with 3x4Gb. The thread also has some arguments for buying this cheap RAM vs. buying ram from OWC etc.

  6. chiefroastbeef macrumors 6502a

    May 26, 2008
    Dallas, Texas/ Hong Kong
    I am also mixing 2x2gb(1066) Apple ram with 2x4gb(1333 clocked down to 1066) Corsair ram with no problems at all.

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