This HP 726718-S21 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. 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.

• 8 GB of memory to heighten your computer's performance
• 288-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 dissipation
• Up to 2133 MHz speed with CL15 latency for playing the latest games and using heavy software