03-16-2017 07:31 AM
Do you stock 1867MHz DDR3 SDRAM for iMac? I don't see this iMac in your checking system. It was purchased today 16 Mar 2017.
27-inch iMac with Retina 5K display
3.3Ghz quad-core Intel Core i5, Turbo boost up to 3.9Ghz
16GB 1867MHz DDR SDRAM - (2x 8GB)
I want to upgrade to 32GB (4x8MB)
03-16-2017 08:07 AM
Thank you for your question.
We do recommend memory for the iMac Retna Late 2015 model. That is the model that takes 1867MHz memory. You can see the website links based on country below.
I was unsure what country you're in so I included all the links. This model can support up to 64GB of memory over 4 memory slots. We also have a great Apple guide and support section on our website. You can see it here: http://www.crucial.com/usa/en/support-memory-mac
If you do have any other questions at all, please don't hesitate to ask.