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Posted on Jun 24, 2016 4:10 AM
Q: What about a 21,5" retina 4k iMac late 2015, does it support one external 4k display with 60Hz?
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According to Apple and EveryMac, Late 2015 21,5-inch Retina 4K iMac supports one external 4K display with 60 Hz and 3840x2160 resolution.