21 IMac RAM configuration

Discussion in 'iMac' started by Jurph, Nov 10, 2011.

  1. Jurph, Nov 10, 2011
    Last edited: Nov 10, 2011

    Jurph macrumors newbie

    Joined:
    Nov 10, 2011
    #1
    Hi!

    I have a late 2009 21.5'' IMac that cam withe the standard 4Gb RAM (2x2GB Modules)

    Now I bought two additional 4Gb RAM modules, so I have 12GB in total.

    What ist the correct disposition of the modules in their sockets that allows to preserve dual channel capability?

    Right now I have inserted them like this:

    BANK 0/DIMM0 4 GB
    BANK 1/DIMM0 2 GB
    BANK 0/DIMM1 4 GB
    BANK 1/DIMM1 2 GB

    is this correct?



    Also, is there a way to check if my mac is really running in dual channel?

    Thank you for your responses :)
     
  2. Veryold macrumors newbie

    Joined:
    Aug 16, 2011
    #2
    You are correct. The slots are in horizontal pairs and you will have the 2x2 in the top slots and the2x4 in the bottom slots.
    I do not believe there is any way of knowing if the memory is running in dual channel. In your set up it should be . The difference is not all that great and has been estimated at 5%. With the extra ram you should have noticed a big increase in performance.
     

Share This Page