Yes, it's in the BIOS. Kick it up a few MHz and test it. If everything is stable then kick it up again and test it...rinse and repeat. If you start to get errors back the timings off and/or kick up the DIMM voltage a notch.
Also, you want to run the FSB and RAM at the same speed for optimal performance, so you're better off just setting the RAM:FSB ratio to 1:1 and playing with the FSB.