Suitable for my iMac? iMac (Retina 5K, 27-inch, 2017) Get memory specifications for iMac (Retina 5K, 27-inch, 2017), then learn how to install memory in this model. Memory specifications This iMac model features Synchronous Dynamic Random-Access Memory (SDRAM) slots on the rear of the computer near the vents with these memory specifications: Number of memory slots 4 Base memory 8GB (2 x 4GB DIMMs) Maximum memory 64GB (4 x 16GB DIMMs) Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria: PC4-2400 (19200) Unbuffered Nonparity 260-pin 2400MHz DDR4 SDRAM