If you have a jumper that explicitly says that it disables AutoConfig RAM, and not just disables the RAM, there should have been a small tool to enable the non-autoconfiged RAM supplied with your accelerator. I know that this kind of tool was supplied with accelerators of about the same generation as the A2630. I don't know if enabling the RAM using that tool will help you, though.
Certain graphics cards allow you to enable only part of the graphics RAM. I don't know if this is possible with the CV3D, or if that will help you, though.