Can you upgrade the RAM in the 27-inch iMac? | iMore
Amazon.in: Buy OWC 32GB (2 x 16GB) 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade for 2017 iMac 27 inch with Retina 5K Display, (OWC2400DDR4S32P) Online at Low Prices in India | OWC Reviews
2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
64GB RAM upgrade kit for 21.5-inch iMAC now offered by OWC - 9to5Mac