Can someone explain or link to an explanation of how the on-board RAM is used on a dual-GPU card like the 9800GX2 or the 4870X2. As I understand it the second RAM is barely used. If it is a 2x512MB card like the 9800GX2 it is limited by the 512MB of RAM just like any 1x512MB would be. Why can't the other RAM be used as well or why is there not just one big RAM that is shared between the cores? If the second RAM is useless why even have it? Why not have 1GB on the first core and no memory and the other since it can't load textures into that one anyway.
Please explain this =)
Please explain this =)