Axiom 16GB DDR2-667 ECC RDIMM Kit (2 x 8GB) for Dell # A2257199, A2257200 - 16GB (2 x 8GB) - 667MHz DDR2-667/PC2-5300 - ECC - DDR2 SDRAM - 240-pin DIMM

Up to 667 MHz speed is enough to run heavy software smoothly while surfing web with dozens of tabs open 16 GB capacity is enough to execute all memory hungry programs simultaneously DDR2-667 interface synchronizes electrical and clock signals for an efficient data transfer rate