This HP P1N51AA compatible 4GB DDR4-2133MHz 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 memory allows you to have more programs open at a time
• 288-pin-pin DDR4 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computer's performance
• Up to 2133 MHz speed with Unbuffered signal and CL15 latency for playing the latest games and using heavy software