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,
AXIOM AX12390806/1 Memory 2GB | DDR2 SDRAM
Elpida 2GB DDR3 PC3-10600 SDRAM SO-DIMM Memory at Amazon.com