Depending on the Motherboard, some BX chipsets can be clocked to 133 Mhz. My old Asus P2B with the 440BX chipset runs 133 mhz coppermine CPUs with PC133 Ram. Its has clock speed setting right in the BIOS for 133 (and 112 and 103 and 97 and 83). It also has the ability to decouple the AGP and PCI speed from the bus speed.

I can't speak for your board though...