Upgrading Memory on my Late 201 iMac

Discussion in 'iMac' started by ravinder08, Feb 8, 2018.

  1. ravinder08 macrumors 6502

    Joined:
    Jun 11, 2010
    #1
    I have a late 2012 iMac 27"with an 3.4 GHz Intel Core i7 processor, I've been getting message that I don't have enough memory and to force quit apps. The iMac has the standard 8GB fitted 2X4GB Modules. My question is should I get another 2X4GB modules or do I just add 1X8GB Module, not sure if it makes any difference 2X4GB Modules compared to 1 8GB
     
  2. nambuccaheadsau macrumors 68000

    nambuccaheadsau

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  3. ravinder08 thread starter macrumors 6502

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    Jun 11, 2010
    #3
    The reasoning?
     
  4. smirking macrumors 68020

    smirking

    Joined:
    Aug 31, 2003
    Location:
    Silicon Valley
    #4
    I don't know if it's true for iMacs, but for the MacPro's of that vintage, it was always advised that you buy your memory in matching sets to get the maximum performance out of your memory. It ran slower on non-matching pairs so if you already had one 8GB module, you'd want that single 8GB module to pair with your existing one. Since you have two 4GB modules, getting another 4GB pair would be best.
     
  5. MjWoNeR macrumors 6502

    MjWoNeR

    Joined:
    Feb 16, 2010
    Location:
    Sweden
    #5
    The memory on the 27” iMac is dual channel.
    Adding just one 8GB stick will be both more expensive than 2x4GB and the memory will be used in single channel mode.

    Just add 2x4GB RAM with the same specs.
     
  6. nambuccaheadsau macrumors 68000

    nambuccaheadsau

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    Oct 19, 2007
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  7. ravinder08 thread starter macrumors 6502

    Joined:
    Jun 11, 2010
    #7
    Thanks for all the replies will be ordering 2X4GB modules
     
  8. T'hain Esh Kelch macrumors 601

    T'hain Esh Kelch

    Joined:
    Aug 5, 2001
    Location:
    Denmark
    #8
    Unless you do specific heavy number crunching, you won't feel a difference in speed between 2x4 or 1x8. Just pick the cheapest.
     

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7 February 8, 2018