4GB KIT (2 x 2GB) For Dell PowerEdge Series 1800 1855 2800 2850 2970 SC1425 SC1435. DIMM DDR2 ECC Registered PC2-6400 800MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) DIMM DDR2 ECC Registered PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Dell PowerEdge Series. (See Compatibility List Below)