I had the opposite happen for me, but not from the same change. I upped my FSB by one from 145 to 146 FSB and saw my 3dmarks2k1 score go from 81xx to 87xx!!! The "nature" test went from around 30fps to 50fps avg....was awesome at such high frames. Gonna OC a bit more tonite and see if I can't break 9k, my system is really close to GF3 Ti500 speeds in the comparison.
Chiz