Hi I was going to add a graphics to my computer. I have a 64mb integrated graphics card now. I only need the extra graphics card because it will have and s-video out. Anyways the graphics memory i will probably buy is also 64mbs, so my question is after that is installed will both my integrated and the new graphics work togeather? Will I then have 128mbs of video memory or will it only be one or the other?