4GB STICK For Asus U Series U24A U31F U31SD U32VJ U32VM U36SD U41JF U41SV U43SD U46E U46SM U46SV U47A U47VC U53SD U56E. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Asus U Series. (See Compatibility List Below)