628974-081-PCW is a HP Compatible 16GB PC3-10600 DDR3-1333 2Rx4 1.35v ECC Registered RDIMM, generic for HP PN# 628974-081. This is a 'major brand' module (from either Samsung, Micron, Hynix, Infineon, etc.), equivalent in every way to HP original memory. All PCW modules meet or exceed OEM specifications and JEDEC standards.