16GB KIT (4 x 4GB) For Dell Studio Desktop Series XPS 435 XPS 8000 XPS 8100 XPS 9000. DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. 16GB KIT (4 x 4GB) DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Studio Desktop Series. (See Compatibility List Below)