This HP 708641-S21 compatible 16GB DDR3-1866MHz Dual Rank Registered ECC 1.5V 240-pin CL13 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.

• Editing high-resolution pictures, rendering 3D graphics and playing the latest games is not a big deal with DIMM 16 GB of memory that effortlessly manages them
• 240-pin-pin DDR3 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 1866 MHz speed with Registered signal for smooth computer performance