4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Low Power Memory for HP Workstation XW8600 (PARTS-QUICK BRAND). Equivalent to HP Part Numbers: 397413-B21, 442823-B21,
HP 4GB RAM 1x4GB PC2-5300F DDR2-667MHz CL5 2Rx4 ECC Server Memory 398708 MICRON | eBay