Winten WT-SD800-D4GB 4GB ( 2GB x2 ) DDR2 PC6400 Noteboon Laptop PC memory (200-pin SODIMM, 800MHz) 4GB kit (2GBx2) DDR2 PC2-6400 LAPTOP Memory Modules 200-pin SODIMM 800MHz Every single module extensively tested at the component and module level for functionality FOR LAPTOPS / NOTEBOOKS / NETBOOKS