This HP 726719-S21 compatible 16GB DDR4-2133MHz dual 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.

• 16 GB bar will run multiple applications together and enhance your computer's performance
• 288-pin-pin DDR4 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performance
• Up to 2133 MHz speed with CL15 latency for smooth computer performance