Crucial Memory Advisor results for the Apple iMac (21.5 and 27-inch, Late 2009).

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device type: desktop

Your iMac (21.5 and 27-inch, Late 2009) System Specs

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

Memory:

DDR3 PC3-8500

Memory Type: DDR3 PC3-8500, DDR3 (non-ECC)
Maximum Memory: 16GB
Slots: 4

These 21.5" and 27" systems utilize one of the following processors: 3.06GHz Intel Core 2 Duo, 3.33GHz Intel Core 2 Duo, 2.66GHz Quad Core Intel Core i5 or 2.8GHz Quad Core Intel Core i7 The SSD is fully functional in the system. The CTSSDCONVT ( 3.5" bracket ) is need to mount the SSD.

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 and 27-inch, Late 2009)

Computer Memory
Solid State Drives