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  1. #1


    Member Since
    Aug 13, 2007
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    10
    Matched pairs w/ memory modules
    If Apple recommends matched pairs (as I have read they do) to optimize RAM performance, how does that apply to my 20" iMac with max capacity of 3 gig? I currently have 2 512 modules on board my core duo (non-aluminum). If I want to max out my RAM to 3 gig, I'm not aware of any 1.5g modules out there.

    What if I replaced one 512mb module with a 2g for a total of 2.5g? How much would the mismatch effect performance, compared to using a 1g and 2g side by side?

  2. #2

    Chilbear's Avatar
    Member Since
    Jun 14, 2007
    Location
    Toronto
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    574
    Specs:
    2xiMac24 w Parallels 6 (1x White, 1x Aluminum), iPhone 3GS with iOS5
    Tt all depends on what you do with the machine. To get 3gb you need 2x2gb or 1x2 plus 1x1gb.

    Enough Ram is totally dependent on what you are going to do. Ram is cheap enough I would fill it up and enjoy the best machines on the planet.

  3. #3

    Kash's Avatar
    Member Since
    Dec 03, 2006
    Location
    Irvine, CA
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    9,385
    Specs:
    Black Macbook C2D 2GHz 3GB RAM 250GB HD iPhone 4 iPad 3G
    Dual Channel RAM doesn't offer that big of a performance boost if you can actually utilize all 3GB as the additional memory will offset any performance loss from the lack of dual channel mode.

    If you need 3GB, then get a 2GB and 1GB module and you're set. If you don't see yourself using all the RAM, then stick with 2GB for the slight performance boost of dual channel mode.

    June 2007
    July 2009

  4. #4


    Member Since
    Aug 13, 2007
    Posts
    10
    Quote Originally Posted by Kash View Post
    Dual Channel RAM doesn't offer that big of a performance boost if you can actually utilize all 3GB as the additional memory will offset any performance loss from the lack of dual channel mode.

    If you need 3GB, then get a 2GB and 1GB module and you're set. If you don't see yourself using all the RAM, then stick with 2GB for the slight performance boost of dual channel mode.
    Thx Kash. That's where i was going with my question. I do a lot of photo editing and audio recording, so I can see using the 3GB. Would the iMac see things as balanced and give me 128MBit memory addressing if I were to use 2x2GB to hit my max of 3GB?? I'm guessing not, and I'm not going to sweat it if it doesn't. I just want to max things out as much as possible.

  5. #5

    Kash's Avatar
    Member Since
    Dec 03, 2006
    Location
    Irvine, CA
    Posts
    9,385
    Specs:
    Black Macbook C2D 2GHz 3GB RAM 250GB HD iPhone 4 iPad 3G
    Don't waste your money on 2x2GB modules, just stick with a 2GB and a 1GB module. I can't answer your memory addressing question as I wouldn't know the answer. Perhaps somebody else can help you out with that.

    June 2007
    July 2009

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