669239-081-PCW is a HP Compatible 8GB PC3-12800 DDR3-1600 2Rx8 1.5 v ECC UDIMM (generic for HP PN# 669239-081). This is a 'major brand' module kit (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.