Compaq/HP 2GB PC2-5300 DDR2-667 2Rx8 ECC DIMM (Compaq/HP PN# 432806-B21) Compatible With HP Part Number: 432806-B21 2GB PC2-5300 DDR2-667 2Rx8 ECC UDIMM For HP Servers only. Not compatible with HP laptops and home computers. Lifetime Warranty Third Party; 100% Compatible