How much RAM does the Apple iMac "Core i5" 3.3Ghz 27-Inch (Retina 5K, 2015) support?

The iMac "Core i5" 3.3Ghz 27-Inch (Retina 5K, 2015) supports up to 32GB of memory across 4 slot(s), up to 8GB per slot.

What type of memory does the iMac "Core i5" 3.3Ghz 27-Inch (Retina 5K, 2015) use?

It uses DDR3L SODIMM memory modules.

Memory Upgrades for Apple iMac "Core i5" 3.3Ghz 27-Inch (Retina 5K, 2015)

Guaranteed-compatible DDR3L SODIMM upgrades for the Apple iMac "Core i5" 3.3Ghz 27-Inch (Retina 5K, 2015), in matched-kit options that fill your slots.

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Memory specifications

Memory type	DDR3L
Form factor	SODIMM
Memory slots	4
Maximum memory	32GB
Max per slot	8GB
Rated speed	1600 MT/s

Good to know

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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