Results 1 to 3 of 3
  1. #1


    Member Since
    Nov 16, 2011
    Location
    England
    Posts
    38
    Specs:
    iMac 27", iPhone 4, iTouch.
    Adding memory to new iMac
    Hi All

    I have just received my new iMac which came as standard with 4Gb RAM. (I believe this is 2 * 2Gb memory cards). I have ordered and received a further 8 Gb (2 * 4Gb) from Crucial, with a view to take my new machine up to a healthy 12Gb of RAM.

    I was about to install the memory this afternoon so decided to look up 'How To' videos on Youtube. The reason for this post is that one of the videos mentioned that the memory should be paired the same size otherwise it will not take advantage of the dual channel aspect of the memory.

    Does this mean if I have a mix of 2Gb Simms (2 * 2Gb) and 4Gb (2 * 4Gb) in the four memory slots that memory performance will be slower . If that is the case may be I should just add the 2 * 4Gb and remove the 2 * 2Gb leaving me with an 8Gb machine.

    Help would be appreciated.

    Cheers

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,524
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    No, it means they should be installed as matched pairs in the SAME bank. You already have 2 x 2 GB modules in the upper bank. Just leave them there. Place the 2 x 4 GB modules in the lower bank. The larger modules really should go in the upper bank for maximum efficiency and speed, however, removing and inserting modules in an iMac requires quite a bit of "thumb" effort, so it's best to leave the smaller modules where they are. I don't think it will make that much difference anyway.

    You might want to use a cloth or small towel (or even gloves) to help push the modules in place. (To save your thumbs.)

  3. #3


    Member Since
    Nov 16, 2011
    Location
    England
    Posts
    38
    Specs:
    iMac 27", iPhone 4, iTouch.
    Quote Originally Posted by chscag View Post
    No, it means they should be installed as matched pairs in the SAME bank. You already have 2 x 2 GB modules in the upper bank. Just leave them there. Place the 2 x 4 GB modules in the lower bank. The larger modules really should go in the upper bank for maximum efficiency and speed, however, removing and inserting modules in an iMac requires quite a bit of "thumb" effort, so it's best to leave the smaller modules where they are. I don't think it will make that much difference anyway.

    You might want to use a cloth or small towel (or even gloves) to help push the modules in place. (To save your thumbs.)
    Yet more fantastic advise from this great forum !!! Thank you very much, you have put my mind at rest. Following your note I installed the new memory this morning. Just booted up the iMac and it recognises the new memory so now on 12Gb.

    You were right about the thumb effort !!!!

    Thanks again

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Adding memory to iMac. Genius bar or me?
    By sueoz in forum Apple Desktops
    Replies: 1
    Last Post: 10-17-2011, 11:13 AM
  2. Adding Memory - Imac G5
    By mrknight13 in forum Apple Desktops
    Replies: 1
    Last Post: 02-03-2011, 03:22 PM
  3. Adding memory in an iMac
    By ceport in forum Apple Desktops
    Replies: 1
    Last Post: 12-17-2010, 01:58 PM
  4. Adding memory to an iMac G4
    By mbusboom in forum Apple Desktops
    Replies: 8
    Last Post: 09-15-2009, 05:44 AM
  5. Adding memory to imac issue
    By tremora in forum Apple Desktops
    Replies: 2
    Last Post: 05-03-2008, 01:32 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •