I have a Voodoo 3 1000, default is 125 mhz, overclocked it to 143mhz ( default for voodoo 3 2000), noticable performance difference. Tried to take it up too 166mhz(default for voodoo 3 3000), even faster but graphics started to become sqiggly and weird spots started to appear. Turned it back down and now problems. I have a heat sink and fan superglued to the chip. Is 166mhz just to high for the card?