The Warp3D Driver for Voodoo 3 coincidentally runs on the Voodoo 5 too, but that does not make it a Voodoo 5 Driver. Some sort of backward compatibility mode of the Voodoo 5. I heard somewhere it would run slower than a real Voodoo 3, do not know if it is true, though. In no way does it use all features of the Voodoo 5.
Steffen