This HP® 815098-B21 compatible 16GB DDR4-2666MHz single rank registered ECC 1.2V 288-pin CL17 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. DIMM 16 GB capacity is enough to execute all memory hungry programs simultaneouslyDDR4 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performanceUp to 2666 MHz speed with Registered signal and CL17 latency for smooth computer performance