2017 iMAC 18,1 and 4K 18,2. 2017 iMAC 5K 18,3. iMac "Core i5" 2.3 21.5" (Mid-2017) 2.3 GHz Core i5 (I5-7360U). iMac "Core i5" 3.0 21.5" (4K, Mid-2017) 3.0 GHz Core i5 (I5-7400). iMac "Core i5" 3.4 21.5" (4K, Mid-2017) 3.4 GHz Core i5 (I5-7500).
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