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I have looked at this question, and apparently my iMac does support mixing memory sizes. However, when I installed 2 4GB memory modules and 2 2GB memory modules, when I clicked  → About This Mac → More Info... → Memory, it said that I had only installed 4 2GB modules. I have checked the packaging, and it still verifies that they are both 4GB modules. For further information, I am running Version 10.9.1 Mavericks.

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If you use only the 4GB modules, what does it say then? If it still see's them as 2GB each, it might be the RAM - who knows, maybe they just put the wrong sticker on it ;)

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