2GB KIT (2 x 1GB) For Alienware Aurora Desktop Series (AMD Phenom Quad-Core Black Edition) 7500 (DDR2) ALX (DDR2) AMD Phenom Quad-Core (Black Edition) Torchbearer Edition. DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 2GB KIT (2 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 Alienware Aurora Desktop Series. (See Compatibility List Below)