What type of memory does the iMac (27 in, Mid 2011) use?

It uses DDR3 SODIMM memory modules.

What storage drives fit the Apple iMac (27 in, Mid 2011)?

Compatible drive types: SATA 2.5" Hard Drive, SATA 2.5" SSD.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (27 in, Mid 2011), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (27 in, Mid 2011) — 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.

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.

Specifications reported for this system.

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Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (27 in, Mid 2011), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (27 in, Mid 2011) — 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.

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.

Specifications reported for this system.