Descent old card pretty cheap. Should work fine in your AGP 4x/8x 1.5v slot (the top dark grey one) assuming you have a full size case and not some slim line thing that only takes low profile cards.
That card does recommend a 350w power supply you probably should make sure you have enough power before doing anything.
Have you looked at the thread I linked to in my first reply? If power is an issue you can cut the slot and get a gt 220 or something.