OWC 64GB X 2400MHz DDR4 Memory Upgrade for the 2017 iMac with Retina 5K Display (4 16GB) SO-DIMM PC4-19200 27-inch (OWC2400DDR4S64S)

64.0GB (16.0GB x 4) 2400MHz DDR4 SO-DIMM PC4-19200 260-pin CL17 Memory Upgrade Compatible with: 27-inch iMac with Retina 5K Display (Mid-2017) and PCs with PC4-19200 SO-DIMMs Memory upgrade kit compatible models: 2017 27-inch iMac with Retina 5K display and the following processors (27-inch i5 3.4GHz, 27-inch i5 3.5GHz, 27-inch i5 3.8GHz, 27-inch i7 4.2GHz) For best performance, install in pairs (two modules at a time). iMac with 5K display has four memory slots, with up to 16GB per slot (up to 64GB total for iMac with 5K display). Guaranteed safe upgrades Backed by an OWC memory lifetime/limited warranty, including OWC's advanced lifetime replacement program