Memory Type: DDR PC2700, DDR PC3200, DDR (non-ECC)
Maximum Memory: 3GB
Supports up to two PC2700 (DDR333) or faster DIMMs or up to three PC2100 (DDR266) DIMMs.
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