yes some motherboards when you add ram you can go into the bios and change the amount of ram the video will use.
Just a heads up dont think that giving it 64 megs of ram or 128 will make it run like a gforce 4 or something tho
also keep up with the video driver updates, my step sister has the same onboard video, i updated the video from windows update and it made a lot of difference in half life