A-TECH 16GB KIT (4 x 4GB) For Gateway FX Desktop FX6850-51u FX6860-UR10P FX6860-UR20P. DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine Brand. 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 FX Desktop. (See Compatibility List Below)