Memory Type: DDR PC2700, DDR (non-ECC)
Maximum Memory: 1GB
If there is only one socket under the cover you removed, you are looking at the Mini PCI Card slot not the memory upgrade slots. You will see two memory sockets if you are looking in the correct location.
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