Alright, this is a question from a newb to hardware, so try to keep the flames down.

I have an integrated AGP from SiS on my motherboard, or so it seems. So, if I buy another Video Card/AGP, say a nVidia GeForce, will I be able to fit it in there and configure it properly? Is there anything else I'd have to do other than stick it in there. I'm running Windows right now and need a new graphics card for compatibility with Linux (SiS are @$$holes), so that's why I'm trying to figure it out. Any help would be appreciated.