You wont find anything in the BIOS about a FSB or Bus Speed on an AMD board.
You need to focus on the 'Advanced' when OC'ing and here you'll find the 'CPU Configuration' and 'Jumper Free Configuration'.
Under 'CPU Configuration' you'll be able to check CPU Type, CPU speed, Cache RAM, change the RAM settings in the 'DRAM configuration' tab, adjust HT frequency multiplier and set 'Cool n Quiet'.
In the 'Jumper Free Configuration' you get to tinker with the CPU frequency, voltages, CPU frequency multipliers, DDR Voltages and more.
The CPU frequency X the CPU Multiplier = CPU speed.
Assuming everything is at stock max the CPU multiplier and increase the CPU frequency until you get stability issues.
Back off 1 MHZ and then increase the CPU voltage little. Check stability. If your computer stabilises again increase your CPU frequency again until it's unstable. If you have a decent aftermarket CPU HS then continue this until you bottle out on your CPU volts. I personally would go to 1.4V - 1.5V max. But thats me and I don't expect everyone to go this high.
Keep going and eventually you'll hit a wall. This'll be the HT and RAM holding you back. This is where you need to start working on the HT speed/multiplier and the RAM divider and timings.
Also consider faster RAM to enable you to reach faster CPU frequencies. I.E. With 800Mhz RAM I doubt you'll be able to reach CPU frequencies of 250Mhz with a RAM divider set to 1:1 whereas if you had 1066Mhz RAM you could ramp the CPU frequency straight up to 250Mhz - 260Mhz to start OC'ing.
Check my sig. I'm using DDR500 to get a better OC although my motherboard specs DDR400.