This HP 672631-S21 compatible 16GB DDR3-1600MHz Dual 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. Adding additional memory is the best way to increase the performance of your system. All our memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. Our products are also guaranteed by federal law to not affect or void OEM warranties.

• DIMM 16 GB bar will run multiple applications together and enhance your computer's performance
• DDR3 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate
• Up to 1600 MHz speed with Registered signal and CL11 latency for smooth computer performance