Upgrading RAM questions

Discussion in 'iMac' started by jabingla2810, Jan 22, 2012.

  1. jabingla2810 macrumors 68020

    Oct 15, 2008
    I have the 27" iMac and it has 4 slots for the RAM.

    Currently I have 2x2GB sticks.

    Pricing up the RAM, there isn't much difference in price between buying 2x2GB sticks and 2x4GB sticks.

    A friend of mine has said that RAM works best when all 4 sticks are of the same value. Is this true?

    Reading online I have read that if the RAM sticks are of different values, it is important that the highest value sticks are placed in the right slots. Is this also true?

    Apologies for the noob questions.

  2. GGJstudios macrumors Westmere


    May 16, 2008
    No. There is a slight performance improvement from using matched pairs, but you could have 2 matched pairs that do not match each other.

    MR Guide to Matched RAM on Intel Macs
    Link to where you read that?
  3. btbrossard macrumors 6502a

    Oct 25, 2008
    I would get the 2x4 GB upgrade to bring your mac to 12 GB total. That seems to going in the $40 range.

    Then, in the future if you want more ram, you can buy another 2x4 GB upgrade to bring you to 16 (by replacing the 2 GB sticks).

    Ram should be installed in pairs for best performance.

    When you put the new ram in your iMac, you can just put the new ram in the free slots.
  4. jabingla2810 thread starter macrumors 68020

    Oct 15, 2008
    Thanks for the replies

    Think ill go for the 2x4GB sticks.


    *I can't find that website at home, I went to the deep ends of the internet at work.... I'll just ignore I read about it :)
  5. btbrossard macrumors 6502a

    Oct 25, 2008
    Here's what Apple says about the positioning of the new RAM in the iMac:

    -If you install additional memory modules, insert then in the open slots

    -If you replace the installed memory modules, insert a new memory module in each of the slots furthest from the display

    Attached Files:

  6. MrNomNoms macrumors 65816

    Jan 25, 2011
    Wellington, New Zealand
    I'd say he is most likely referring to Quad Channel Memory:


    Scroll down close to the bottom of the article. IIRC benchmarks I've seen give something like only a 1-3% improvement on average. I've moved 2 x 2GB over to my Mac from my MacBook Pro (same memory as what is installed in my iMac) and I've noticed no performance increase over and above what one would expect from a memory upgrade.

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