MODULES MUST BE ORDERED AND INSTALLED IN GROUPS OF TWO OR FOUR. Modules should be identical in size.
This system is configurable and can ship with DDR2-533 or DDR2-667. When mixing DDR2-533 and DDR2-667 modules, the system will default DDR2-533 speed.
If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). A 64-bit Operating System is required to utilize more than 4GB of memory.