How much RAM does the Apple iMac 21.5-inch support?

The iMac 21.5-inch supports up to 16GB of memory across 2 slot(s), up to 8GB per slot.

What type of memory does the iMac 21.5-inch use?

It uses DDR3 SODIMM memory modules.

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Apple iMac 21.5-inchMemory Upgrades

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System specifications for Apple iMac 21.5-inch

Specifications reported for the Apple iMac 21.5-inch.

Memory type: DDR3
Form factor: SODIMM
Memory slots: 2
Maximum memory: 16GB
Max per slot: 8GB
Rated speed: 1600 MT/s
Processor: Intel i5 4570 (2.9 GHz)

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.

Software

Free tools from Seifelden — no purchase needed.

Seifelden Upgrade AssistantFree

Checks the drivers on your Apple iMac 21.5-inch, installs the safe updates Windows offers, guides the rest to the official download — and confirms exactly which of the upgrades above your machine has room for.

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Your system

Apple iMac 21.5-inchMemory Upgrades

Change system Auto-detect

8 guaranteed-fit options

This option is out of stock.

System specifications for Apple iMac 21.5-inch

Specifications reported for the Apple iMac 21.5-inch.

Memory type: DDR3
Form factor: SODIMM
Memory slots: 2
Maximum memory: 16GB
Max per slot: 8GB
Rated speed: 1600 MT/s
Processor: Intel i5 4570 (2.9 GHz)

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.

Software

Free tools from Seifelden — no purchase needed.

Seifelden Upgrade AssistantFree

Apple iMac 21.5-inchMemory Upgrades

Choose your upgrade

System specifications for Apple iMac 21.5-inch

Software

Apple iMac 21.5-inchMemory Upgrades

Choose your upgrade

System specifications for Apple iMac 21.5-inch

Software