MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode. Kingston offers "K2" kit part numbers for Dual Channel mode.
If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration).
DDR2-400, DDR2-533, and DDR2-667 modules can be mixed, however, they will default to the module with the slowest speed.
Maximum configurations require 64-bit operating system.