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I'm waiting for my iMac 27" late 2015 4.0ghz i7 to arrive and I'm looking to buy a 32gb kit to upgrade. I've been browsing for an hour and I can't find any specific buyer guides or websites that sell Mac compatible memory (in the EU).

According to Apple's RAM specs, I managed to find this: PCPartPicker.com

This is what the Apple specs say:

  • PC3-14900
  • Unbuffered
  • Nonparity
  • 204-pin
  • 1867MHz DDR3 SDRAM

Source: Install memory in an iMac

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You will need two "16GB Kits" (four 8GB modules in total) to get the full 32GB. I have personally done this in my 2012 iMac 27"

iMac 32GB RAM Slots

The memory that I recommend is Crucial 16GB Kit (8GBx2) DDR3L - PN# CT2K8G3S186DM

I recommend Crucial because they are very reliable and they have a lifetime warranty. There are brands that are cheaper, but (IMO) it's simply not worth the cost savings. I have found that not only is the quality better (fewer failures with lifetime warranted memory versus non-lifetime warranted) the customer service has always been much "stronger" in terms of getting faulty memory replaced.

  • Did you do that on a mid or late 2015 model? – Nikolay Dyankov Jul 15 '16 at 12:29
  • Mine was a 2012. But the upgrade is exactly the same. The PN# I provided is specific to the 2015 as it matches the specs you outlined in your question. – Allan Jul 15 '16 at 12:30
  • Looks like exactly what I was looking for. Thanks! Accepting answer in 3 mins... – Nikolay Dyankov Jul 15 '16 at 12:32
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I usually buy any branded memory with the same pins and MHz and it always work. But there are brand names that manufacture for Apple products, like OWC. But Corsair and Crucial etc have memory sets as well, specifically designed for Mac:

Adamanta | ArchMemory | Crucial | Corsair

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