I had pentiums with voodoos back then, when Unreal came out it did not perform particularly well on that hardware compared to nvidia and didn't have the same graphics quality. Unreal with the nvidia TNT2/GeForce 256 marked the beginning of the end for the voodoo era, if memory serves.

3dfx hay day was really quite quake-centric, you'd be remiss to not use their hardware in a vintage quake pc build.