How much RAM does the Apple iMac (21.5 in, Mid 2010) support?

The iMac (21.5 in, Mid 2010) supports up to 16GB of memory across 4 slot(s), up to 4GB per slot.

What type of memory does the iMac (21.5 in, Mid 2010) use?

It uses DDR3 SODIMM memory modules.

Compatible drive types: SATA 2.5" SSD.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (21.5 in, Mid 2010), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (21.5 in, Mid 2010) — matched to its drive bays and slots.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

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Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (21.5 in, Mid 2010), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (21.5 in, Mid 2010) — matched to its drive bays and slots.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.