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. Specs: 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) Many thanks.
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