as far i understand about the nforce chipsets,
these Mobo's have an
intergated video card on the mobo itself. (geoforce 4Mx)
if you want to use a better video card you can use an ATI or nvidia card, with no problems.
on a side note : switching from 4x to 8x AGP wouldn't be a real performance boost.
it all depands on the processor and the memory etc, to get closer to the theoreticly max bandwith of the videocard.
only with the latest gen vid cards you can have a slightly performance with 8x AGP
atleast, that'a what a read these last years..
so my 2 cents,
don't bother buying a new mobo
invest in 512Mb "faster" memory (is it drr 333 your processor and MOBO can handle?)
edit: this link will tell you wich type of athlon xp2200 you have
http://www.overclockers.com/tips00173/
