A-Tech 8GB (2x4GB) 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
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UPGRADED iMac 21.5" 4K RETINA Desktop - 1TB Storage - 2017-2019 - 16GB RAM | eBay
iMac Intel 21.5" Retina 4K Display (2017) RAM and SATA Hard Drive Upgrade - iFixit Repair Guide
iMac Intel 21.5" Retina 4K Display (2017) RAM Replacement - iFixit Repair Guide
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
iMac (Retina 4K, 21.5-inch, 2017) - Technical Specifications
iMac 21.5-inch (2017) Review: Ultimate Refinement | Macworld
Review: Apple's 21.5" iMac with Retina 4K display gets solid 2017 architectural refresh | AppleInsider
Memory Upgrades for iMac 21.5-Inch 2017
64GB RAM upgrade kit for 21.5-inch iMAC now offered by OWC - 9to5Mac
Apple 21.5in iMac with Retina 4K display (2017) review | Stuff
Install memory in an iMac - Apple Support
Timetec 16GB Compatible for Apple 2017 iMac (27-inch w/Retina 5K, 21.5-inch w/Retina
Amazon.com: 2017 Apple iMac with Intel Core i5 (21.5-inch, 8GB RAM, 1TB Storage) - Silver (Renewed) : Electronics
Apple 21.5 iMac Retina 2017 4K Display, Intel Core i5, 3 GHz, 8GB RAM, 1Tb HDD | eBay
NEMIX RAM 64GB (4X16GB) SODIMM Memory Upgrade Kit DDR4 2400MHz PC4-19200 Compatible with Apple iMac
Apple 21.5 iMac Retina 2017 4K Display, Intel Core i5, 3 GHz, 8GB RAM, 1Tb HDD | eBay
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
Buy Used & Refurbished Apple iMac 4K 21.5-inch (Mid 2017) 3.4GHz i5 1TB SSD Fusion Drive 32GB RAM All-In-One Desktop - Computers & Electronics
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How to upgrade RAM in the (Mid 2017) 5K iMac and save up to ~$900 [Video] - 9to5Mac
iMac Intel 21.5" Retina 4K Display 2017 Teardown - iFixit
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Apple iMac A1418 2017 21.5" 4K Intel i5 3.0GHz 8GB RAM 1TB HDD Pro 555 2GB *READ | eBay
Apple iMac 21.5'' Retina 4K Core i5 3.0GHz 16GB 1TB Fusion A1418 MNDY2LL/A 2017 | eBay
Refurbished 2019 21.5 inch iMac with Retina 4k display MRT32LL/A - Buy Used iMac 2019 at Techable
iMac review: Pricing, Specifications, and Features | Macworld
