4GB KIT (2 x 2GB) For Dell PowerEdge Series R200 T100 T105. DIMM DDR2 ECC Unbuffered PC2-6400 800MHz Dual Rank RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) DIMM DDR2 ECC Unbuffered PC2-6400 800MHz Dual Rank 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)