8GB KIT 2 x 4GB Dell Inspiron 13z 5323 14 3421 14R 3437 14R 5421 14R 5437 7420 14R N4050 14R N4110 15 3520 N5030 15 N5040 N5050 15R 5537 15z Ultrabook 5523 17 3721 17R 3737 5721 5737 M4040 Memory Ram 8GB KIT (2 x 4GB) SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Inspiron Notebook Series. (See Compatibility List Below)