HP 16GB [2X 8GB] PC2-5300 DDR2-667 2Rx4 ECC Fully Buffered FBDIMM Memory Kit (HP PN# 413015-B21) Compatible With HP Part Number: 413015-B21 16GB [2x 8GB] PC2-5300 DDR2-667 2Rx4 ECC Fully Buffered FBDIMM Memory Kit Two Piece Memory Kit For HP Servers only. Not compatible with HP laptops and home computers. Third Party; 100% Compatible