What motherboard? I'm using a BH6, MSI slocket & Globalwin HSF, and I cannot go over 100Mhz on the FSB either. If I enable turbo for 103Mhz, I get all kinds of video problems (tearing, lockups). I have an ATI Radeon 32 DDR, and I'm wondering if it doesn't tolerate the out-of-spec bus speed very well.