Is it possible to use 2x2GB and 2x4GB = 12 GB in an iMac 27" late 2009?
According to this RAM vendor I trust, yes:
You can go to 16GB with 4x4GB is needed.
That is exactly the configuration I have in my late 2009 Quad i5, works great. One tip buy good ram from Crucial or OWC.
Thank you! I have installed it and it runs perfect!
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