4GB STICK For Gateway SX Series SX2855-UB11P SX2855-UB12P SX2855-UB22P SX2855-UR10P SX2855-UR11P SX2855-UR20P SX2855-UR21P SX2855-UR30P SX2855-US10P SX2860 SX2860-43M SX2860-55 SX2860-CI5-2400 SX2865 SX2865-UR10P SX2865-UR11P SX2865-UR15 SX2865-UR26 SX2865-UR308 SX2865-UR328 SX2865-UR348 SX2870 SX2870-UR10P. DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK 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 SX Series. (See Compatibility List Below)