16GB KIT (4 x 4GB) For Alienware Aurora Desktop Series Aurora-R2 Aurora-R4 Aurora-X79. DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. 16GB KIT (4 x 4GB) DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Alienware Aurora Desktop Series. (See Compatibility List Below)