Mixed ram size

Hello,

I recently purchased a new IMac with intel i7 quad core. I requested that the standard 4GB of ram (2-2GB DDR3) that comes with the system be switched out for 8 GB (2-4GB DDR3). To my surprise when I got home the tech had left in the original 4 GB and also added the 8 GB to the open two slots for a total of 12GB.

I have read that it is not a good idea to have modules of different sizes, so is it worse to have the additional 4GB because there is now a mix of RAM sizes?

Thanks
3 answers Last reply
More about mixed size
  1. As long as they work in dual channel, it isn't an issue.
  2. sorry to be a novice, but I am new to macs...how can i tell if they are working in dual channel?

    below is information from the System Profiler:
    ECC: Disabled

    BANK 0/DIMM0:

    Size: 2 GB
    Type: DDR3
    Speed: 1067 MHz
    Status: OK
    Manufacturer: 0x80AD

    BANK 1/DIMM0:

    Size: 2 GB
    Type: DDR3
    Speed: 1067 MHz
    Status: OK
    Manufacturer: 0x80AD

    BANK 0/DIMM1:

    Size: 4 GB
    Type: DDR3
    Speed: 1067 MHz
    Status: OK
    Manufacturer: 0x80AD

    BANK 1/DIMM1:

    Size: 4 GB
    Type: DDR3
    Speed: 1067 MHz
    Status: OK
    Manufacturer: 0x80AD
  3. Since DIMM0 and DIMM1 are identical in each channel, they should be in dual-channel mode.
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