4GB Low Power DDR2-667 ECC RDIMM Kit (2 x 2GB) TAA Compliant - 4 GB (2 x 2 GB) - DDR2 SDRAM - 667 MHz DDR2-667/PC2-5300 - ECC - Registered - DIMM

667 MHz of memory speed makes your computer great at multitasking 4 GB of memory to refine your computers performance 240-pin-pin DDR2 SDRAM 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