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There's nothing that they are missing that the 2014s have, so it's obviously arbitrary in that case. They probably dropped those too because they wanted to keep some form of "consistency" or something (I know this sounds stupid but I honestly see Apple doing this).Īs for the Iris Pro 5200 only 21.5" iMacs, they're more powerful than the low end 1.4GHz HD 5000 2014 iMacs and yet they're not supported. However, the 27 inch has 2GB of VRAM and a GTX 755 so I have no idea why that was dropped. Every 2012 Mac that was dropped either had 512MB or 1GB VRAM. They probably wanted to drop anything with 1GB of VRAM or less in it and that happened to include that iMac model.
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The higher end 21.5" late 2013 iMacs use 750Ms, except that they only have 1GB of VRAM compared to 2GB on the MacBook Pros from the same era (as well as the 2013 Mac Pros which had anywhere from 4GB-12GB of VRAM depending on which model of dual GPUs you picked), which is possibly why those specific 2013 iMacs are not supported. Reasons why I think the 2013 iMacs aren't supported:
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