OWC 48GB (2 x 16GB + 2 x 8GB) 1867 MHZ DDR3 SO-DIMM PC3-14900 204 Pin CL11 Memory Upgrade Compatible with 2015 (Late) iMac 27" w/Retina 5K Models and Compatible PCs (OWC1867DDR3S48S) at Amazon.com
MacBook Pro (Retina, 13-inch, Early 2015) Processor 2.7 GHz Intel Core i5 Memory 8 GB 1867 MHz DDR3 Graphics Intel Iris Graphics 6100 for Sale in Alexandria, VA - OfferUp
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A-Tech 16GB (2x8GB) RAM for Apple iMac Late 2015 27 inch Retina 5K | DDR3L 1866MHz / 1867MHz PC3L-14900 1.35V 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
OWC 16GB (2 x 8GB) 1867 MHZ DDR3 SO-DIMM PC3-14900 204 Pin CL11 Memory – DirectNine - Europe
8GB Memory Upgrade Kit for 2015 iMac with 5K Display
Logic Board - 3.1 GHz Core i5 8 GB Ram - iMac Retina 4K 21.5" Late 201 - Part Haven