A-TECH 1GB KIT (2 x 512MB) For Dell Latitude 100L C540 C640 C840 D400 D500 D600/D800. SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory. Genuine Brand. 1GB KIT (2 x 512MB) SO-DIMM DDR NON-ECC PC2100 266MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Latitude. (See Compatibility List Below)