Its built into the drivers. Open up regedit. Go to this key:
HKEY_LOCAL_MACHINE\Software\3Dfx Interactive\3dfx Tools\Installed\Tools.
There is a key under that called 3dfxTools Overclocking. Set the
CompleteRegistration value to 1. Reboot. You will now have an overclocking tab.
I took my 166mhz v3-3000 to 185 before it starting showing graphical glitches. I then rested a cpu fan on the pci card 2 slots below it pointing up at the heatsink and it would not do 195 stable in win98, however in win2k its stable at the max 220mhz that the utitily allows. Not a bad overclock i though and ive run it like that for a few months now, make sure u have an extra fan if u overclock as i could not get into windows to slow it down when i removed the fan briefly
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