8GB KIT (4 x 2GB) for Dell XPS 420 710/710 H2C 710/710 H2C 720 720 H2C. DIMM DDR2 Non-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
Specs DELL Dimension XPS 420 Desktop Mini Tower Intel® Core™2 Quad Q6600 2 GB DDR2-SDRAM 500 GB AMD Radeon HD 3870 Windows Vista Home Premium PC PCs/Workstations (D06X409)