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CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Dell® Inspiron 15R (5521) - A7 at Amazon.com
Adamanta 16GB (2x8GB) Laptop Memory Upgrade for Dell Inspiron 15R 5521 DDR3 1600Mhz PC3-12800 SODIMM 2Rx8 CL11 1.5v Notebook DRAM at Amazon.com
OFFTEK 8GB Replacement Memory RAM Upgrade for Dell Inspiron 15R (5521) (DDR3-10600) Laptop Memory at Amazon.com
