64GB KIT (16GBX4) Memory Upgrade for New iMac 5K/Retina June 2017 Intel Quad Core i5, i7 with Model ID: 18,3
Samsung 64GB KIT (16GBX4) DDR4-2400, PC4-19200, Non-ECC, Unbuffered, 1.2V, 260pin SO-DIMM
For iMac 27" with Retina 5K display June 2017 with Model ID: 18,3
27" 3.4GHz i5 27" 3.8GHz i5
27" 3.5GHz i5 27" 4.2GHz i7
This iMac has 4 memory slots supporting up to 16GB per slot for a maximum of 64GB. Install memory in pairs for optimum performance.
Eagle Memory uses a non-stacked module for the DDR4-2400Mhz modules for the iMac. The cheaper stacked IC variety of SO-DIMM draws more power, which increases heat and can cause increased errors. Eagle Memory ONLY uses premium non-stacked chips.