How much memory? How many buffers?
The most essential difference between different boards using the Voodoo Graphics ™ chipset is the amount and organization of memory. Quantum3D used a three digit scheme to descibe boards. Here is a slightly modifed one (anticipating Voodoo 2 ™). Note that if you use more than one Texelfx, they need the same amount of texture cache memory each, and if you combine two Pixelfx, each needs the same amount of frame buffer memory.