A-Tech 4GB STICK Toshiba Satellite L635-SP3002M L635-SP3003 L635-SP3003L L635-SP3003M L635-SP3004 L635-SP3004L L635-SP3004M L635-SP3006 L635-SP3006L SO-DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory 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 Toshiba Toshiba Satellite. (See Compatibility List Below)