How much RAM does the Apple iMac with Retina 4K display (21.5 in, Mid 2017) support?

The iMac with Retina 4K display (21.5 in, Mid 2017) supports up to 32GB of memory across 2 slot(s), up to 16GB per slot.

What type of memory does the iMac with Retina 4K display (21.5 in, Mid 2017) use?

It uses DDR4 SODIMM memory modules.

Memory Upgrades for Apple iMac with Retina 4K display (21.5 in, Mid 2017)

Guaranteed-compatible DDR4 SODIMM upgrades for the Apple iMac with Retina 4K display (21.5 in, Mid 2017), in matched-kit options that fill your slots.

Choose your upgrade

Memory specifications

Memory type	DDR4
Form factor	SODIMM
Memory slots	2
Maximum memory	32GB
Max per slot	16GB
Rated speed	2400 MT/s
ECC	none

Good to know

Faster modules automatically run at your system's maximum supported speed.
Maximum capacity per slot is inferred from total capacity ÷ number of slots.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

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Memory Upgrades for Apple iMac with Retina 4K display (21.5 in, Mid 2017)

Guaranteed-compatible DDR4 SODIMM upgrades for the Apple iMac with Retina 4K display (21.5 in, Mid 2017), in matched-kit options that fill your slots.

Choose your upgrade

Memory specifications

Memory type	DDR4
Form factor	SODIMM
Memory slots	2
Maximum memory	32GB
Max per slot	16GB
Rated speed	2400 MT/s
ECC	none

Good to know

Faster modules automatically run at your system's maximum supported speed.
Maximum capacity per slot is inferred from total capacity ÷ number of slots.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.