4GB KIT (2 x 2GB) For Dell Latitude Series 5400 5500 6400 6500 ATG E6400 D830 E5400 E5500 E6400 E6400 ATG E6400 XFR E6500. SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Latitude Series. (See Compatibility List Below)