A 32mb card? ouch! I haven't seen one of those in a long time. I thought the 64mb models were dinosaurs at this point!
The support page for that model board for the downloadable user manual is seen at ASUSTeK Computer Inc.-Support-
You have to scroll down the page most of the way as usual there to find the English version with the links for that. That shows a max of 2gb of PC2100 memory with three dimm slots and the expect 1.5v AGP slot.
The main support for the model is found at ASUSTeK Computer Inc.-Support-
in case you want to look for the latest bios or drivers that were originally released.
For a better card any 128mb 4x/8x AGP model card would certainly see an improvement over what you have there by a long shot. Even an old 64mb model would see a small boost. But don't too much at this point for the older system there performance wise.