If you have a 1/5 PCI divider on your motherboard you can for sure hit 166 FSB. Also is your chip the new tbred or the old palamino, and is it unlocked? Because you'll need to lower the multiplier in order to hit 166fsb. Because your ram can hit 166fsb for sure. My tbred b 1800xp hits 2400xp easily using a gc69 with a panaflo.