can you mix 2gb and 4gb memory modules

I have a late 2009 iMac, which came with 2x 2GB memory (4 GB in total). I have two available slots for additional memory, can I add 2 x 4 GB memory modules, to give me a total of 12 GB or memory?

  • Asked by John M from Virgil
  • Sep 15, 2012
Apple Memory Module 4GB 1066MHz DDR3 ECC 1x4GB

Apple Memory Module 4GB 1066MHz DDR3 ECC 1x4GB

Product No Longer Available

2 Answers from the Community

  • Best Answer:

    Better not to. In order to work properly and avoid crashes, work with twin modules, same size and manufacturer.

    • Answered by Paulo Marcelo A from Knoxville
    • Nov 9, 2012
  • yes. This is the wrong memory for that imac though.

    • Answered by Posi M from Roseville
    • Sep 23, 2013