4GB STICK For MSI Whitebook MS-1656 MS-1675 MS-1681 MS-16F2 MS-1733 MS-1736. 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 MSI Whitebook. (See Compatibility List Below)