Does the Voodoo Graphics ™ store 24 or 32 bit z-buffer per pixel?
No. The Voodoo Graphics ™ architecture uses 16bpp internally for the depth buffer, too. This again is true for Voodoo Graphics ™, Voodoo Rush ™ and Voodoo 2 ™ alike. Again, Quantum3D claims that using the floating point 16-bits per pixel (bpp) depth buffering provides 22-bpp effective Z-buffer precision.