Corsair Vengeance LPX 8GB (1 x 8GB) DDR4 DRAM 2400MHz C16 (PC4-19200) Memory Kit - , Vengeance LPX Black at Amazon.com
Crucial DDR4 kit 16 GB 2 x 8 GB SO DIMM 260 pin 2400 MHz PC4 19200 CL17 1.2 V unbuffered non ECC for Apple iMac with Retina 5K display Mid 2017 - Office Depot