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When shoving the memory in, I cannot get it to click (or get it deep enough for the lid to close). Are the dimensions different or do I need to push harder?!
Specs say that the 27" late-2013 RAM is 204-pin PC3-12800 while the late-2009 RAM is 204-pin PC3-8500. When you physically compare the RAM carrier boards, are they identical in height, width, thickness and indexing guide slot locations?
Red arrows are index guide slots.