Yes, I am running a Celeron 600. I'm not sure that the CUSL2-C has dividers, instead, it has ratios in the CMOS. If you start with 66 FSB, you can increment upwards until 99, but the PCI multiplier is 1/2. At FSB 100 plus, you get 1/3 but i don't have a good HS for it. I had a c566 on the bx...