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Description

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.

Solution

Open the Registry:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\Class\Display\0000\Glide\

Add string value:
"FX_GLIDE_NUM_TMU"

Set value:
"2"

Sometimes the Registry value 0000 differs a bit. Search for 0001, 0002, ... instead.