I'm using a p3 500mhz right now with a tnt2 and from what i've seen I think a gf2mx would be about right for the price/performance ratio. Of course I'm not sure how the performance would compare to a voodoo3, but there probably wouldn't be a very big gain. I get around 20-30 fps in UT with my tnt2, but the framerate drops pretty bad when a lot of bullets and bodies start flying around. I would say that at the very least an upgrade to either a gf2mx or ti would stabilize the framerate quite a bit and a little performance gain. Anyway, I'm pretty sure that the gf2ti would get you pretty close to the upper framerate limit of this processor, keeping low cost in mind