Axiom 16GB DDR2-667 ECC RDIMM Kit (2 x 8GB) for HP # 408855-B21 - 16GB (2 x 8GB) - 667MHz DDR2-667/PC2-5300 - ECC - DDR2 SDRAM - 240-pin DIMM

667 MHz of memory speed makes your computer great at multitasking 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 DDR2-667 operates at up to 400 MHz data bus speed with minimal power consumption and as a result, you get optimal computer performance with an improved memory heat dissipation