MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode.
Faster memory will clock down to run at optimal speed depending on processor model installed.
Although it is physically possible to install more memory, the system will only recognize 8GB maximum.
If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system.