Winten WT-LD800-D4GB 4GB ( 2GB x2 ) DDR2 PC6400 DeskTop PC memory (240-pin LODIMM , 800MHz) 4GB 2X 2GB DDR2 800MHz PC2-6300 PC2-6400 DDR2 800 (240 PIN) DIMM Desktop Memory 100% Compatible with Desktops 2x2GB PC2-6300 PC2-6400 DDR2 800 Mhz. Supports Dual Channel Compatible with desktops that support DDR2 240 pin memory