Crucial Memory Advisor results for the Apple iMac (21.5-inch, Late 2011).

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device type: desktop

Your iMac (21.5-inch, Late 2011) System Specs

System specs as shipped by the manufacturer.
Scan your system to view your specific system configuration.

Memory:

DDR3 PC3-10600

Memory Type: DDR3 PC3-10600, DDR3 (non-ECC)
Maximum Memory: 8GB
Slots: 2

System utilizes a 3.1GHz Intel Dual Core i3 processor

Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.

video - installing memory

Guaranteed-compatible upgrades for your Apple iMac (21.5-inch, Late 2011)

Computer Memory