A-TECH 1GB KIT (2 x 512MB) For Dell Dimension 2300C 2350 2400 4400 4500/4500C 4500S 4550 4590T. DIMM DDR NON-ECC PC2100 266MHz RAM Memory. Genuine Brand. 1GB KIT (2 x 512MB) 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 Dimension. (See Compatibility List Below)