wow, talk about retro...
anyways, the Voodoo 2 beats the crap out of a Rage Pro of course!
for ePSXe etc:
If you're using Pete's D3D plugin you can click on "Select device" at the top and choose the Secondary to use the Voodoo 2.
Or you can use Lewpy's 3dfx plugin which will use your Voodoo 2 only.