How much RAM does the Apple iMac with Retina 5K display (27 in, Mid 2017) support?

The iMac with Retina 5K display (27 in, Mid 2017) supports up to 64GB of memory across 4 slot(s), up to 16GB per slot.

What type of memory does the iMac with Retina 5K display (27 in, Mid 2017) use?

It uses DDR4 SODIMM memory modules.

Guaranteed-compatible DDR4 SODIMM upgrades for the Apple iMac with Retina 5K display (27 in, Mid 2017), in matched-kit options that fill your slots.

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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Guaranteed-compatible DDR4 SODIMM upgrades for the Apple iMac with Retina 5K display (27 in, Mid 2017), in matched-kit options that fill your slots.

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.