This HP 593915-S21 compatible Factory Original Tier 1 - 16GB DDR3-1066MHz 1.35V LRDIMM 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. 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 the Magnuson-Moss Warranty Act to not affect or void OEM warranties.

• Editing high-resolution pictures, rendering 3D graphics and playing the latest games is not a big deal with 16 GB of memory that effortlessly manages them
• 240-pin-pin DDR3 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate
• 1066 MHz of memory speed with CL9 latency makes your computer great at multitasking