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OWC - 64GB Memory Upgrade Kit - 4 x 16GB PC21300 DDR4 2666MHz SO-DIMMs für 27-inch iMac with Retina 5K und kompatible PCs: Amazon.de: Computer & Zubehör
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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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