A-TECH 16GB KIT 4x 4GB Dell Optiplex 790 MT/DT/SFF 790 USFF 7900 Desktop 9010 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 Dell Optiplex. (See Compatibility List Below)