This HP 805349-B21 compatible 16GB DDR4-2400MHz 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 simultaneously288-pin-pin DDR4 SDRAM operates at an effective bus speed with minimal power consumption and as a result you get optimal computer performance with an improved memory heat dissipationUp to 2400 MHz speed with Registered signal for playing the latest games and using heavy software