Upgrading RAM on a Late 2009 iMac

Discussion in 'iMac' started by bbasra, Sep 7, 2012.

  1. macrumors member

    Jul 4, 2012

    I have a iMac Late 2009 which has 4GB RAM and takes 1066MHz DDR3 SDRAM.

    Your Mac contains 4 memory slots, each of which accepts a 1067 MHz DDR3 memory module.
    2 memory slots in use, 2 available.

    I would like to upgrade the ram another 8gb and ideally get the same Manufacturer. How can i find out without opening the iMac to see what RAM i currently have installed. :confused:

  2. oosk2k8, Sep 7, 2012
    Last edited: Sep 7, 2012

    macrumors member

    May 25, 2011
    well 4gb ram in 2 slots would be 2x2GB.. so to make it 8gb, you just need 2x4gb in the 2 available slots.

    EDIT: you mean what manufacturer of ram? If so, search System Information in Spotlight, navigate to Memory, click on a Memory module and the Manufacturer information should be there. If it's a wierd string of numbers/letters such as '0x02FE' then maybe this will help:

    0x014F - Transcend Information
    0x2C00—Micron Technology, Inc.
    0x802C—Micron Technology, Inc.
    0x80AD—Hynix Semiconductor Inc.
    0x80CE—Samsung Electronics, Inc.
    0xAD00—Hynix Semiconductor Inc.
    0xCE00—Samsung Electronics, Inc.

    (Source: http://forums.macrumors.com/showthread.php?t=1159737)
  3. thread starter macrumors member

    Jul 4, 2012
    Crucial, Kingston, Corsair etc etc all make RAM thats compatible with my iMac.

    I'd just like to upgrade it with the same memory that is currently installed rather than mix it up.

    I understand it shouldn't make a difference but the price is marginal between the Crucial, Kingston, Corsair.
  4. macrumors member

    May 25, 2011
  5. thread starter macrumors member

    Jul 4, 2012
    Thanks for that.

    BANK 0/DIMM0:

    Size: 2 GB
    Type: DDR3
    Speed: 1067 MHz
    Status: OK
    Manufacturer: 0x80CE
    Part Number: 0x4D34373142353637334548312D4346382020
    Serial Number: 0x79D1CF2E

    Looks like i have Samsung. Oh well, not sure to go with Crucial, Kingston, or Corsair.


    Also, is there a memory limit? Will my iMac work with 12gb RAM? :confused:
  6. macrumors 65816


    Nov 14, 2009
    The memory limit for those machines is 16GB. And yes, 12GB will work (2x2GB and 2x4GB).
  7. macrumors member

    May 25, 2011
    Yeah, all alleged Apple proprietary RAM is Samsung. Despite their war with the company over patents, they do seem to get on their knees a lot for their RAM and iPad processor lol.

    To be honest, if there's not much between them in price, I'd go for Crucial, that's what I've used in my iMac and MBP for the past 5 years, they're reliable I've found.
  8. macrumors 603


    Apr 13, 2010
    I owned that mac you are better off with the samsung. I could give a long set of reasons why but that machine worked with every possible combination of samsung ram

    1 x x x
    1 x x 1
    1 x x 2
    1 x x 4

    1 1 x x and so on all the way up to 4 4 4 4

    I have had it not like some crucial sticks /
    I have had it not like some gskill sticks and that machine has had more then 50 sticks placed in and out of it.
  9. macrumors 68000


    Dec 17, 2009
    Folsom, CA
  10. macrumors member

    May 25, 2011
  11. thread starter macrumors member

    Jul 4, 2012

    :confused: I cannot seem to find any Samsung memory in the UK and a place i have found want £160 for it whereas the other manufactures are around £30-£36. The last thing i want to do is order some ram and it doesn't work.
  12. philipma1957, Sep 9, 2012
    Last edited: Sep 9, 2012

    macrumors 603


    Apr 13, 2010
    too overpriced. try the crucial


    amazon uk has a 30 day return policy. is cost 17 pounds 71 pence a stick decent price. it should work.
  13. macrumors newbie


    May 24, 2012
    My iMac is a late 2009 21" and i upgraded it to 16gb RAM, some of the guys here probably remember my topic on it becuase i bought some cheap RAM and had a whole bag of problems from it.

    My advice, go crucial. I Paid £80 for 16gb RAM and it works perfectly straight out of the box.
  14. macrumors newbie

    Jun 24, 2010
    Trouble inserting new RAM

    I have a 2009 Imac with 4G Ram, so I ordered an additional 8G to make 12 total. No problem opening up the computer, but when I tried adding the new RAM to the lower 2 slots, it would not go in completely. I then took out the old ones that were in the upper slots, inserted the new 4G rams, and no problem, they went in easily. I then tried putting the old RAM into the lower slots, no go.

    Closed up the computer and it works fine, now I have 8G RAM but wanted 12.

    Any ideas on how to solve this?


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