HP Compatible 8GB PC3-12800 DDR3-1600 1Rx4 1.5v ECC Registered RDIMM (HP PN# 647651-081) Compatible With HP Part Number: 647651-081 8GB PC3-12800 DDR3-1600 1Rx4 1.5v ECC Registered RDIMM For HP Servers only. Not compatible with HP laptops and home computers. Lifetime Warranty Third Party; 100% Compatible