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Late 2015 - iMac17,1

Compatible upgrades for: MK462LL/A, MK482LL/A, BTO/CTO  5K 27-inch iMac

Standard RAM:     8 GB     
Maximum RAM:     64 GB*
Details:     By default, 8 GB is installed as two 4 GB memory modules (and two slots are unoccupied).
RAM Slots:     4
*Officially, this model supports four 8 GB modules -- one in each slot for a maximum of 32 GB of memory. However, as first discovered by site sponsor OWC, it actually will support 64 GB of memory using four 16 GB modules.