I'm about to buy a new baseline 27 inch, and I am going to upgrade the RAM to 8 gigs.
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Sent from my DROIDX using Tapatalk
Yes. I'd put the new 4GB RAM into the slots originally occupied by the 2GB modules, then put the 2GB into the empty slots. From what I've read, the CPU accesses the top slots first, so you want the larger modules there. This configuration should keep dual-channel memory enabled.
From the apple support document, this is really not necessary to move the 2 gb chips