Variation of already asked question:
I now understand that I can add two matched 8 GB sticks of RAM into the two empty slots, even though the other two slots are filled with two 4 GB modules. But is there a problem having one pair 1.5v if the other pair are 1.3v?
It would appear to not be a problem, if as reported elsewhere, the iMac has 1.5v preinstalled and Crucial is recommending 1.35v sticks. Is that a faulty assumption?