4GB Kit (2 X 2GB) PC2100 266MHz 184 pin Registered DDR SDRAM ECC DIMM Memory RAM for Dell PowerEdge 650 1750 2600 2650 Server P/N: 311-1827, KTD-PE2650/4G 2x2GB PC2100 ECC Registered 184PIN DIMMs Compatible with Dell PowerEdge 650, 1750, 2600, 2650 (400MHz FSB), 2650 (533MHz FSB)