![A-Tech 16GB (2x8GB) RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 1.2V 260-Pin SO-DIMM Memory Upgrade Kit at Amazon.com A-Tech 16GB (2x8GB) RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 1.2V 260-Pin SO-DIMM Memory Upgrade Kit at Amazon.com](https://m.media-amazon.com/images/I/81fFnvBpIaS.jpg)
A-Tech 16GB (2x8GB) RAM for Apple iMac 2017 (27 inch Retina 5K & 21.5 inch Retina 4K) | DDR4 2400MHz SODIMM PC4-19200 1.2V 260-Pin SO-DIMM Memory Upgrade Kit at Amazon.com
![2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider 2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider](https://photos5.appleinsider.com/gallery/21640-25066-21622-24977-IG1JLCr6OejKtfEx-l-l.jpg)
2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
![Amazon.com: Apple iMac 21.5-inch Retina 4K Display MNDY2LL/A Mid-2017 - Intel Core i5 3.0GHz, 8GB RAM, 256GB SSD, macOS Mojave - Silver (Renewed) : Electronics Amazon.com: Apple iMac 21.5-inch Retina 4K Display MNDY2LL/A Mid-2017 - Intel Core i5 3.0GHz, 8GB RAM, 256GB SSD, macOS Mojave - Silver (Renewed) : Electronics](https://m.media-amazon.com/images/I/616gV6XY+4L._AC_UF894,1000_QL80_.jpg)
Amazon.com: Apple iMac 21.5-inch Retina 4K Display MNDY2LL/A Mid-2017 - Intel Core i5 3.0GHz, 8GB RAM, 256GB SSD, macOS Mojave - Silver (Renewed) : Electronics
![Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider](https://photos5.appleinsider.com/gallery/21707-25280-FullSizeRenderjpg-2-xl.jpg)