A graphics card and graphics accelerator are the same thing.
The reason why it is called an accelerator is because that is exactly what it does. If you have a good video card in your PC, then all of the processing tasks that would normally be left to the
CPU are done by the GPU instead.
I think your looking for a way of increasing the graphical capabilities of your current 9600, but I'm afraid the only way to do this is to replace the card entirely.