I've had a look through the BIOS and found the following :
FSB Spread Spectrum which is disabled but can be set to 0.5% or 1%.
The CPU External Frequency is set to 100MHz, and the manual tells me that the FSB isequal to twice this value. I can set the CPU External Frequency in increment of 1, 2, 3 or 5 MHz. Various options can take it up to 211 MHz. What should I set it to?