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iMac with Retina display review: best in class, but not everybody needs one | Engadget
Apple iMac with 4K Retina display (21.5-inch, 2015) review: Apple packs more pixels into its smallest iMac - CNET
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
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2015 27-inch iMac with Retina 5K display review | Should I buy an iMac? | Macworld
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How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
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iMac (Retina 5K, 27-inch, Late 2015) - Technical Specifications
21in 4K Retina iMac (2015) review | Macworld
Install memory in an iMac - Apple Support
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