I am a big fan of voodoo for older slower processors. I run a Guillemot Maxigamer Phoenix Banshee card on a Tyan TX chipset motherboard with a P-233 MMX processor. With 128 MB of ram, it does pretty well for a 3 year old system. I tried a Voodoo 3 3000 PCI and while it seemed a little faster, I think the processor was holding it back. The V3 3000 runs great in my Celeron 366 and also works well in my main system. Still pondering an upgrade to a geforce 2 MX in my main system, but have so far resisted the temptation.
Chuck