it has a jumper so you can choose between 100 or 133 FSB (depending on your processor). theres no feature in the BIOS for FSB adjustment. the only processor i have overclocked with it was a 1.8 (400 FSB). i set the jumper to 133 so i got it up to 2.4 ghz. in other words the only processor you can overclock with it is a 400 FSB one that is capable of 133 FSB (533) at DEFAULT VCORE.
for my friends who would ask me to build them PC's -this is my mobo of choice being inexpensive and easy to install and never gave me a headache so far.