4GB KIT 2x 2GB Gateway SX Series Desktop SX2800-01 SX2800-01r SX2800-07 SX2801-02M SX2803-25e SX2803-53 SX2803-UB20P SX2803-US20P DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory Genuine A-Tech Brand 4GB KIT (2 x 2GB) DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Gateway SX Series Desktop. (See Compatibility List Below)