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Thread: iMac RAM

  1. #1
    iMac RAM
    nickyr's Avatar
    Member Since
    Nov 01, 2007
    Location
    Swansea - South Wales
    Posts
    1,045
    Your Mac's Specs
    2017 iMac 27" (10.14.4), 2015 MBPr, (10.14.4), iPhone 6 (12.2).
    iMac RAM
    Hi everyone

    I ordered my iMac with 8GB (2x4GB) of RAM, but took the early opportunity to buy some more Crucial RAM.

    I ordered another 8GB, thinking I'd ordered 2x4GB sticks, but when it arrived today it was just the one 8GB stick.

    Anyway, I've popped it in and the machine recognises it just fine.

    My query is though, is it OK using RAM in this configuration (i.e. 2x4gb, 1x8gb and 1x empty slot)?

    Will ordering another 8GB stick, giving me 24GB in total, be a viable option, or should I return the RAM and get 2x4GB sticks?

    Thanks :-)

    Just realised that after nearly 12 years on the forum this is my 1,000th post!!! When should I expect my long service award to arrive?
    Johann Gambolputty de Von Ausfern....of Ülm

  2. #2
    Yes, you can use 2 8GB sticks to get up to 24GB. You do not need to use match pairs anymore.

    Your award is in the mail, keep an eye out for it!
    --
    Regards
    ...Ashwin


  3. #3
    iMac RAM
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    40,784
    Your Mac's Specs
    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
    I think getting that single 8gig stick of RAM was the way to go. This way if you ever decide to fill all RAM slots with 8gig sticks...you'll end up with a total of 32gig...and less 4gig RAM sticks removed (and less money invested in 4gig sticks of RAM).

    Congrats on the 1000th post...and super-duper awesome that this is your 12th year as a Mac-Forums member!

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  4. #4
    iMac RAM
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    57,754
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    I ordered 2 x 4GB modules from OWC for my iMac which gave me a total of 16GB. That's more than enough for my usage. You should be fine with 24GB for years to come.

    And like has already been stated.... congrats on your 1000th Post and for being a member of our forums for 12 years.

  5. #5
    iMac RAM
    nickyr's Avatar
    Member Since
    Nov 01, 2007
    Location
    Swansea - South Wales
    Posts
    1,045
    Your Mac's Specs
    2017 iMac 27" (10.14.4), 2015 MBPr, (10.14.4), iPhone 6 (12.2).
    thanks guys - that's good to know. I think I'l get another 8gb stick in the near future. I got mine (Crucial) for just under £60. I used their RAM in my old iMac and never had an issue with it.
    Johann Gambolputty de Von Ausfern....of Ülm

  6. #6
    iMac RAM
    dtravis7's Avatar
    Member Since
    Jan 04, 2005
    Location
    Modesto, Ca.
    Posts
    29,980
    Your Mac's Specs
    iMac late 2012 21.5 i5 10:14. iMac 2010 27"QuadI7 OS10.13, MBPLate2011, iPad Pro10.5", iPhone7
    I did that basic thing on my 2010 i7 iMac. I first added 2x8 then got another 8 then finally one last 8 for 32 GB. I ran a memory speed tester each time and with all 4 modules installed the speed was faster indicating Dual Channel Ram.

    I agree with Nick that going with 8GB modules is the way to go especially for the future!

  7. #7
    iMac RAM
    ProTruckDriver's Avatar
    Member Since
    Jul 31, 2016
    Location
    Chesapeake, Virginia
    Posts
    100
    Your Mac's Specs
    Late 2015 5K 27-inch iMac, 4GHz i7, 16GB RAM, 1TB Fusion Drive, macOS Mojave, 10.14.4
    Quote Originally Posted by Raz0rEdge View Post
    Yes, you can use 2 8GB sticks to get up to 24GB. You do not need to use match pairs anymore.
    I have a question. iMac Late 2015, 27 inch: I have 2 8GB sticks in now = 16GB. Do they have to be installed in pairs? Can I just put one more 8GB stick in for 24GB?
    Dave
    iMac Clone and Backup with SuperDuper, Time Machine & iCloud
    AdGuard, Malwarebytes Beta Browser Extensions

  8. #8
    iMac RAM
    nickyr's Avatar
    Member Since
    Nov 01, 2007
    Location
    Swansea - South Wales
    Posts
    1,045
    Your Mac's Specs
    2017 iMac 27" (10.14.4), 2015 MBPr, (10.14.4), iPhone 6 (12.2).
    mine (late 2017) is working fine with 3 sticks of RAM, so my guess is your's would be just fine as well :-)
    Johann Gambolputty de Von Ausfern....of Ülm

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