On 3dfxzone two other files are on line: tdfx bios editor and Voodoo5 5500 PCI DVI rom. The first is a good 3dfx Voodoo4 and Voodoo5 bios editor. It requires bin or rom file in input. The second is a rom for V5 PCI, very useful to give x86 compatibility to Mac Voodoo5 cards.
Grab these here