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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?!

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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?

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Red arrows are index guide slots.

  • Unfortunately, I cannot get the existing RAM out (it seems rather stuck). Therefore, I could only try shoving the new RAM into the open slots. I wanted to, but cannot compare. – Keep these mind Dec 17 '18 at 17:13
  • After some comparing with the visible bits and measuring the depth, I had a renewed go. It took a lot more strength than I had expected, but the new memory (both of them) are in. (Now let's see if it also works. :)) – Keep these mind Dec 17 '18 at 17:57
  • And the answer to that is... No. :( (beep beep beep) – Keep these mind Dec 17 '18 at 18:01
  • RAM is incompatible, as I predicted. :-( – IconDaemon Dec 17 '18 at 19:06

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