This HP Z9H59AT compatible 4GB DDR4-2400MHz Single Rank Unbuffered 1.2V 288-pin CL15 UDIMM 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.

• 4 GB of memory to refine 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
• No matter how heavy and numerous the applications that you are using, 2400 MHz memory speed will run them smoothly