This HP 647897-B21 compatible 8GB DDR3-1333MHz Dual Rank Registered ECC 1.35V 240-pin CL9 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 8 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance
• DDR3 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 dissipation
• Up to 1333 MHz speed with CL9 latency for smooth computer performance