This HP 726717-B21 compatible 4GB DDR4-2133MHz single rank registered ECC 1.2V 288-pin CL15 factory original RDIMM is 100% guaranteed to be compatible with your system and to work right the first time. All of our server memory is built to strict JEDEC standards at one of the tier 1 facilities (Samsung, Micron, or Hynix). Our products are also guaranteed by federal law to not affect or void OEM warranties.

• 4 GB of memory to refine your computer's performance
• DDR4 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate
• Up to 2133 MHz speed with Registered signal for smooth computer performance