HP 8GB [2x 4GB] PC2-6400 DDR2-800 2Rx4 ECC Registered RDIMM Memory Kit (HP PN# 504351-B21)

504351-B21-PCW is a HP Compatible 8GB [2x 4GB] PC2-6400 DDR2-800 2Rx4 ECC Registered RDIMM Memory Kit (HP PN# 504351-B21). 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.