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  1. #1


    Member Since
    Apr 12, 2007
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    Specs:
    2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse
    Question Why 3Gb memory limit in 20" & 24" iMac's?
    Hi Everyone,

    Isn't it optimal to have matched banks of memory?
    My 20" iMac came with 2 512Mb SIMMs which were upgraded to two 1Gb SIMMs. Would a third SIMM perform as well as the matched set?

    cheers

  2. #2

    narf1899's Avatar
    Member Since
    Feb 05, 2007
    Posts
    465
    Specs:
    iMac 20" C2D 2.4 ghz 2gb iMac 20" C2D 2GB 256MB Graphics Macbook C2D 2GB Powermac G4 Dual 450
    i believe that the imac can support 4gb (dual 2gb modules)....someone correct me if im wrong
    iMac Aluminum 20" 2.4 ghz 2gb RAM 300gb HD
    iMac 20" Core2duo 2gb 250gb
    Macbook White Core2duo 2gb 80gb
    Powermac G4 dual 450

  3. #3


    Member Since
    Apr 12, 2007
    Location
    Vancouver, BC
    Posts
    101
    Specs:
    2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse
    This is straight off the Apple website:

    17-inch model with 2.0GHz processor, 20-inch and 24-inch models

    * 1GB (2x512MB) of PC2-5300 (667MHz) DDR2 memory
    * Two SODIMM slots support up to 3GB

  4. #4

    narf1899's Avatar
    Member Since
    Feb 05, 2007
    Posts
    465
    Specs:
    iMac 20" C2D 2.4 ghz 2gb iMac 20" C2D 2GB 256MB Graphics Macbook C2D 2GB Powermac G4 Dual 450
    yes they say that, but they also say macbooks can support 2 gb, when its proven they can actually support 3gb.
    iMac Aluminum 20" 2.4 ghz 2gb RAM 300gb HD
    iMac 20" Core2duo 2gb 250gb
    Macbook White Core2duo 2gb 80gb
    Powermac G4 dual 450

  5. #5

    gilesjuk's Avatar
    Member Since
    Apr 03, 2007
    Posts
    301
    Specs:
    Black MacBook 2GB, Mac Pro 2.66Ghz 3GB X1900.
    You can use either 2 x 2GB or 1 x 1GB and 1 x 2GB. But for some reason the max is 3GB. Most standard PCs only address 4GB anyway, the OS can work around it though, you get the option of highmem in Linux.

  6. #6

    Benjamindaines's Avatar
    Member Since
    Jan 08, 2005
    Location
    A religiously oppressed state
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    Specs:
    17" MacBook Pro
    Quote Originally Posted by gilesjuk View Post
    But for some reason the max is 3GB.
    It's the Intel chipset. The C2Ds can only use 3GB before you get what they call memory overlapping (basically things get stored more than once, so why bother with the extra gig if it's just going to be wasted anyway).
    Quote Originally Posted by narf1899 View Post
    i believe that the imac can support 4gb (dual 2gb modules)....someone correct me if im wrong
    You are wrong :p

  7. #7


    Member Since
    Apr 12, 2007
    Location
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    101
    Specs:
    2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse
    Thanks for the info folks. :-)

    Question, how many people have 3Gb RAM in their iMac?

  8. #8

    gilesjuk's Avatar
    Member Since
    Apr 03, 2007
    Posts
    301
    Specs:
    Black MacBook 2GB, Mac Pro 2.66Ghz 3GB X1900.
    Quote Originally Posted by ItsMeDave View Post
    Thanks for the info folks. :-)

    Question, how many people have 3Gb RAM in their iMac?
    Not yet, but I will replace the 1GB module with a 2GB soon. My iMac came with 2GB installed and I was expecting 1GB, so I had already planned on buying RAM.

    With Linux I managed to edit Canon 5D RAW files on my laptop which only has 512MB. So I would imagine you only need 3GB if you are editing huge files, or need to have a few open at once.

  9. #9


    Member Since
    Apr 12, 2007
    Location
    Vancouver, BC
    Posts
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    Specs:
    2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse
    Do you recommend sticking with the same brand of memory?

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