I say,try runnig a D3D game.if it works,well,dont fix something that isnt broken
.if you have problems when running it (errors,or wont launch at all),I would try the latest
SFFT driver (extract the package,go to the device manager,find the v3,click update driver,choose instal from a specific location,point it to the folder where you extracted the driver,ignore xp moaning about driver not being certified,install,reboot,and that should be it).I dont have a voodoo3 installed right now but I will check on it personally if you continue to have that prob..