This HP 803028-B21 compatible 8GB 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.

• 8 GB memory allows you to have more programs open at a time
• 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
• No matter how heavy and numerous the applications that you are using, 2133 MHz memory speed with Registered signal will run them smoothly