133 fsb won't work after overclocking cpu

[thx-118]

I have an athlon b@1gig the default multiplier is 7.5*133. After unlocking the cpu is now running at 1.2gig or 12*100. The problem I have is that I can longer use the 133 fsb. The computer will not boot on any multiplier using then 133fsb. My mother board is an abit kt7a-raid rev 1.1. Please help I now have a cpu that is clocked 20% higher, but a computer that is now slower in brenchmarks due to the 100fsb. I want my 133fsb back