Are you sure you mean 133MHz? My Voodoo3 1000 AGP came out of the box at 143. Either mine was factory overclocked, or some bastard has underclocked your board. Either way, she'll take 143 no problem, CRANK HER UP!
Also, have you enabled the second TMU? The 1000 (AKA the Velocity 100) comes with 1 of it's TMU's dissabled (cutting the RAM in half didn't cripple it enough for 3FX's liking). There is a simple registry hack which I'll dig out for you if you havn't got it, adn which really boosts your performance in Open GL an Glide (D3D has both TMU's by default).
My train of thought is a runaway!!
AHHH, I think my computer's got a Virus!
Oh no, that's Windows XP
Chimaera: Twin Athlon MP 1900+ @ 1824Mhz, GeForce 3 TI500, 512Megs Crucial RegECC, 100GB Total HDD, SuSE Linux 7.3 + Windoze XP Pro