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Message: <blockquote data-quote="zarathu" data-source="post: 1269777" data-attributes="member: 138477">On the Mid 2011 macsApparently what needs to be done is this(since I only bought one 4 gig ram chip, and I'd like to get started with it):Move the two initially supplied 2 gig ram chips from the top two slots to the bottom two slots.  Put the new 4 gig ram chip in the one top slot.I've ordered a second 4 gig ram chip to also go in the top slot when it comes in, but in the mean time this works.  Also apparently, you have to have only the same size ram in both slots side by side/bottom-top, this means that you can have a total of 4, 8 , 12 or 16 gigs, but not 2, 6, 10, or 14 gigs(unless you were using 2- 1 gig chips in one of the bottom or top slots).</blockquote>