8GB KIT (4 x 2GB) For Dell Precision Workstation Series R5400 Rack T7400. DIMM DDR2 ECC Fully Buffered PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 8GB KIT (4 x 2GB) DIMM DDR2 ECC Fully Buffered PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell Precision Workstation Series. (See Compatibility List Below)