I have upgraded the memory in my new 27' late 2013 iMac and it has been an interesting experience. When you have the iMac face down with the stand toward you, number the DIMM slots 1,2,3,4 with 1 nearest the base of the machine (amazingly, I have failed to find an illustration of which physical slots correspond to which Bank/DIMM slots. This is basic information and I can't find it.) iMac came with 8 GB of Ram, one DIMM installed in slot 1, the other in Slot 3 (using my numbering).
I believe that these are Bank0/DIMM0 and Bank1/DIMM0. I also have a late 2012 mac mini which came with two 2GB DIMMs. I upgraded the mac mini with two 8GB DIMMs purchased from Crucial. Worked perfectly. I stored the original 2GB sticks in the Crucial packaging. Here's what I did: • Removed the 2 8GB DIMMs from the mac mini. • Removed the 2 4GB DIMMs from the iMac.
Apple iMac 27-Inch (Late 2013) Computer Memory Questions. What type of memory does the Apple iMac 27-Inch (Late 2013) Computer take? The Apple iMac 27-Inch (Late 2013) Computer takes the PC3-12800 DDR3 SODIMM 204-Pin memory memory type, and comes installed with 8GB(Removable) memory.
• Installed the 2 4GB DIMMs in the mac mini. It has been running without problems since (a couple of hours). • I couldn't find information identifying the memory slots vs Banks/DIMMs, so I guessed. I installed the two 8GB DIMMS in slots 1 and 3 and the 2 2GB DIMMs in slots 2 and 4. • I restarted the iMac.
However, in short order I had an application crash--never happened before. I discovered the system report and found that I had the following configuration: • Bank0/DIMM0 - 8GB • Bank1/DIMM0 - 8GB • Bank0/DIMM1 - 2GB • Bank1/DIMM1 - 2GB This is not optimal, and I wondered if it could be causing the problem. While I wondered about this, the machine crashed.
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Photo cropping software for mac. At least it wasn't the blue screen of death 🙂 but only because it wasn't blue. • I changed the memory installation configuration to this to put match pairs of DIMMs in Banks. • Bank0/DIMM0 - 8GB • Bank1/DIMM0 - 2GB • Bank0/DIMM1 - 8GB • Bank1/DIMM1 - 2GB • Restarted.
Pretty soon, it crashed again. I have now removed the 2 2GB DIMMs from the iMac and put the 2 8GB DIMMs such that my configuration is now: • Bank0/DIMM0 - 8GB • Bank1/DIMM0 - 8GB • Bank0/DIMM1 - Empty • Bank1/DIMM1 - Empty It's been running without problem for longer than any other iteration. My diagnosis is that the 2 2GB DIMMs are bad. They were the original memory in the mac mini and I had no problems with them there. Is there a possibility that the Bank0=16GB and Bank1=4GB is the culprit? Thanks for any comments. You've certainly tried a lot of configurations; my comment here would be to address the new configuration of the slots in the new iMacs.
The slots used to be two rows with two slots next to each other and you matched two modules horizontally. On the new iMacs, the slots are arranged vertically; the 'matching' needs to be slots 1 and 3, and/or 2 and 4. The confusing thing is that the graphics in About this Mac still shows them arranged the way they used to be (which makes no sense whatsoever). The other problem is that they are still calling the banks 0 and 1 which makes it more confusing; however, I'd say that the two '0' banks are slots 1 and 3, and the '1' banks are 2 and 4. As I don't have a new iMac with that arrangement, it's a bit difficult to respond as to the configurations; however, it appears that your arrangement in your # 1 (8/2/8/2) should be the way to do it; your arrangement in #2 (8/8/0/0) would be the last thing I'd go with, but you said it is working. Edit: I just now looked at the tech specs from Apple and here is what it says: It says configurable to 16 or 32 GB - I would read that as: the only supported configurations are 16 or 32 - not 20, 24, or whatever? That may be the answer as to why the two 8 GB modules are working.