This HP 466440-B21 compatible 8GB (2x4GB) DDR2-667MHz dual rank fully buffered ECC 1.8V 240-pin CL5 factory original FBDIMM kit is 100% guaranteed to be compatible with your system and to work right the first time. All of our server memory is built to strict JEDEC standards at one of the tier 1 facilities (Samsung, Micron, or Hynix). Our products are also guaranteed by federal law to not affect or void OEM warranties.

• DIMM 8 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance
• 240-pin-pin DDR2 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate
• Up to 667 MHz speed with Fully Buffered signal is enough to run heavy software smoothly while surfing web with dozens of tabs open