Now lets see if I understand. You have replaced the the original graphics card with a nVIDIA 6200AGP8x 350MHz Graphics Card.
From the Dell web site it only shows one update for the Bios but it does not state what it was for so should not be used.
Although it does have several driver updates for graphics cards these are not for the new card you have installed and should not be used. Go to the nVidia web site for new updated drivers.
From my memory the bios does not indicate how much memory the graphics card uses. I could be wrong.