Ok, try this one and see if it make sense. I've been running my Duron on a 133 bus for almost a year, and haven't been able to multiplier clock. I put the jumper back into the board for 100 FSB, and viola! Multiplier clockable! This make any sense? Now, my question. I'm able to run the DRAM clock at 133 with the bus at 100. I just ran a 3D Mark 2001 se. The results at 10x100 were about 150 points lower than 7.5x133. Will I get better performance if I keep upping the multiplier on the 100 bus, or would it be better to stay at 997MHz on a 133 bus? Any idea why I can't multiplier clock on the 133 bus? I have to admit the temperture is lower at 10x100 than 7.5x133.