This HP 647879-S21 compatible 8GB DDR3-1600MHz single rank registered ECC 1.5V 240-pin CL11 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 8 GB memory allows you to have more programs open at a time
• 240-pin-pin DDR3-1600/PC3-12800 operates at an effective bus speed with minimal power consumption and as a result, you get optimal computer performance with an improved memory heat dissipation
• No matter how heavy and numerous the applications that you are using, 1600 MHz memory speed with CL11 latency will run them smoothly