16GB KIT 4x 4GB Gateway DX Series DX4840-01M DX4840-02e DX4840-03e DX4840-07 DX4840-11e DX4840-15 DX4840-37 DX4850-27eu DX4850-45u DX4850-57 DX4850-H74D DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory 16GB KIT (4 x 4GB) DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Gateway DX Series. (See Compatibility List Below)