Memory Type: DDR2 PC2-6400, DDR2 (non-ECC)
Maximum Memory: 3GB
Although the memory can be installed one module at a time, the best performance comes from using matched pairs of modules.Maximum memory is reached by using one 2GB SODIMM and one 1GB SODIMM.
How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found here.
Memory or DRAM is the "working" memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.
video - installing memory