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21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
Apple iMac 27-inch (late 2013) Reviews, Pricing, Specs
Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
21.5" iMac Desktop Computer (Late 2013) + Battery Back Up + AppleCare + USB Card Reader + USB-C Adapter + 4-Port USB Hub - Walmart.com
Amazon.com: USB C to Mini DisplayPort Cable(Not Thunderbolt 2), QCEs Unidirectional Thunderbolt 3 to Mini DisplayPort Cable 4K 6.6Ft Compatible with Type C MacBook Pro/Air/iMac/Mac Mini/Surface to Mini DP Monitor : Electronics
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Differences Between 2013/2014 iMacs and Late 2015 iMacs: EveryMac.com
Late 2013 iMac review: Faster than before, but the gains over previous models are modest
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Apple 21-inch iMac, late 2013 review | TechRadar
Apple iMac 27-inch (late 2013) Reviews, Pricing, Specs
iMac (27-inch, Late 2013) - Technical Specifications
iMac i5 3.2 27-inch (late 2013) ports/man… - Apple Community
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Differences Between Late 2013 iMacs (Tapered Aluminum): EveryMac.com