It would have to be three different front side bus speeds. Normal, Fast and Faster. How much, I do not know. You could select the middle one. Save the changes, reboot the computer, re-enter BIOS and see what it did to speeds and clocks. If it locks up, just clear the CMOS and start over with the failsafe settings.
I have a Soyo board for AMD's and it has something similar. I have never used it because of the chipset and the SCSI card don't make nice once a different than default clock speed setting is chosen.
I also did a hasty scan of your mainboard manual from the SoyoUSA website and found no mention of it there.