00D4968-PCWA is a 100% IBM compatible 16GB PC3-12800 DDR3-1600 2Rx4 1.35v ECC Registered RDIMM memory module, a third party equivalent to IBM 00D4968. This is a Tier 1 module (from either Samsung, Micron, Hynix, Infineon, etc.), equivalent in every way to IBM original memory. All PCW modules meet or exceed OEM specifications and JEDEC standards. This module comes with a lifetime warranty and is 100% guaranteed compatible. PCW also stands behind our product by offering no-questions-asked returns for this part within 30 days of the purchase date. Buy with confidence!