holy **** batman... that thing is ancient!
welcome to this millenium!
Also are you sure it's actually ProSavage, if my memory serves right ProSavage was their integrated solution. Anyways the card is either PCI or agp, and since agp doesnt fit it's probably pci version... Secondly getting any sort of drivers for 'recent' cards to work on such an old system might be a bit difficult. What operating system are you running? what are the rest of the specs?
I had S3 Virge on one of my earliest systems...
edit had to check, there have been several different slot versions for agp, so things got be a bit more complicated