4GB STICK For Asus U Series U30Jc U30SD U31JG U32U U33JC U35F U35JC U36JC U43JC U45JC U50F U52F U53JC UL20FT UL30JT UL50AT UL80JT. SO-DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK SO-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 Asus U Series. (See Compatibility List Below)