If you're one of those people who's planning on upgrading from a Voodoo 1 to one of those newfangled Voodoo 3 cards, take note of this bit sent along by Mark Muller of Volition:

I added a few Voodoo 3s to our stable here today and when upgrading from voodoo 1 to the 3, I encountered problems if *all* voodoo 1 driver files were not removed before installing the new card. This includes, but is not limited to the following: glide.dll, glide2x.dll, glide2x.ovl, sstinit.dll, dd3dfx.drv, dd3dfx16.dll, dd3dfx32.dll, and fxmemmap.vxd. If these files aren't removed, chances are the machine will lock on running any 3d accelerated game. Upgrades from Voodoo2 went smoothly with no extra steps needed.

I'd suggest doing a HD search for these files before you install that new card, as Voodoo 1 uninstall programs have been known to leave these lingering around.