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Memory Type: DDR3 PC3-10600, DDR3 (non-ECC)Maximum Memory: 16GB
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.
Install Guide for your: MacBook Pro 2.2GHz Intel Core i7 (15-inch DDR3) Early-2011
Installing DRAM/SSD in:MacBook Pro 2.2GHz Intel Core i7 (15-inch DDR3) Early-2011