4GB KIT (4 x 1GB) For Dell Vostro 200 220 Mini Tower 220s Slim Tower 320 400 420 Tower 410 A180 Tower. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (4 x 1GB) 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 Vostro. (See Compatibility List Below)