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2017 21.5-inch 4K iMac memory upgrade kit includes 32GB of RAM, tools to take it apart | AppleInsider
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OWC 16GB 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade For 2017 iMac 27 inch with Retina 5K display, (OWC2400DDR4S16G): Amazon.co.uk: Computers & Accessories
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