I have a ATI RADEON EXPRESS 200 SERIES video card adapter, with 256MB of DDR memory. I was thinking about installing a dual VGA video card so I can put the dual monitor feature with windows XP to use. I saw one online for $6, which appears pretty cheap, but it only uses 16MB of DDR memory. I have no clue what the memory means on video cards. Is it the amount of memory windows needs to allocate from the RAM to run the card, which inevitably tells about the picture quality of the card? I have most of my computer knowledge based around performance so I don't really know much about picture and video cards and what not. Help?