48GB KIT (6 x 8GB) For Dell Precision Workstation Series T5500 (ECC Registered) T7500. DIMM DDR3 ECC Registered PC3-8500 1066MHz Quad Rank RAM Memory. Genuine A-Tech Brand. 48GB KIT (6 x 8GB) DIMM DDR3 ECC Registered PC3-8500 1066MHz Quad Rank 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)