Timetec Hynix IC 8GB Compatible for Apple 2017 iMac 27-inch w/Retina 5K Display, 2017 iMac 21.5-inch w/Retina 4K or Non-Retina Display DDR4 2400MHz PC4-19200 1Rx8 CL17 SODIMM Memory |

Design For Apple 2017 iMac 27-inch w/Retina 5K Display model ID: iMac 18,3 (i5 3.4GHz, i5 3.5GHz, i5 3.8GHz, i7 4.2GHz) Design For all Apple 2017 iMac 21.5-inch w/Retina 4K Display or Non-Retina Display model ID: iMac 18,2 (i5 3.0GHz, i5 3.4GHz, i7 3.6GHz) and iMac 18,1 (i5 2.3GHz) DDR4 2400MHz PC4-19200 260 Pin Unbuffered Non-ECC 1.2V CL17 Single Rank 1Rx8 based 1024×8 Module Size: 8GB Package: 1x8GB Power Supply: VDD 1.2V (1.14V to 1.26V) VDDQ 1.2V (1.14V to 1.26V)