Ever since 3DFX went out of business, there has been a strong demand for 3DFX drivers for various cards. These site(s) will help you discover many of the 3DFX drivers for your card.
Site #1:
Description: This is the best place I could find that has and updates it 3DFX drivers.
Site #2:
Description: This is the original site for 3DFX drivers. I think its still up.
If you know of more sites with 3DFX drivers please send them in. My e-mail is [email protected]