3dfx sold the Velocity 100 as a low budget card to OEM. The chip is exactly a Voodoo 3 with a different marking on top to hide it's real nature. So in fact the Velocity 100 has the same 2 TMUs as the Voodoo 3 but only one is activated.
Open the Registry:
Add string value:
Sometimes the Registry value 0000 differs a bit. Search for 0001, 0002, ... instead.