2GB STICK For Dell Vostro Desktop Series 220 Mini Tower 220s Slim Tower 320 (All-In-One) 420 Tower A180 Tower. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 2GB STICK 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 Desktop Series. (See Compatibility List Below)