A-Tech 4GB STICK Gateway SX SX2311-03 SX2370-UB30P SX2370-UR10P SX2370-UR30P SX2370-US10P SX2850-01 SX2850-33 SX2851-09e SX2851-41 SX2851-41e DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory 4GB STICK 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. (See Compatibility List Below)