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This HP 726718-B21 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 memory is built to strict JEDEC standards to meet or exceed the Tier 1 OEM's factory requirements. The products are also guaranteed by federal law to not affect or void OEM warranties.