Overclock a Voodoo 4 4500

I'm building a comp for my little brother out of old stuff I have laying around. I found an old Voodoo 4 video card and decided to use that. After finally finding the Win XP drivers for it (Thank you 3dFX for going out of business an hanging me out to dry on my voodoo series cards you bastards) I have got it working. I would like to squeeze everything I can get out of this card and I have an xtra fan laying around. Has anyone successfully overclocked a 3dfx card and what did you use?
Thanks

Not Related Question. Any suggestions on new sound cards?

powerstrip might do it, see justins tut at turtletips on ocing a video card

Click teh link in my sig..:)

Thanks, that helped a bit