Dividers are used when you have one component that runs way faster than another component, a common one being the RAM and FSB. In your BIOS, you'll either see a couple of options for running your RAM. It'll be either in fractions (3/4, 5/6) or speeds (133, 166,200). If your BIOS runs dividers with fractions, just take the FSB speed you are running and multiply it by the fraction to get the RAM speed you would get (ie. 250mhz fsb x 5/6 = 208mhz RAM). If your BIOS runs dividers with speed grades divide the speed grade by 200 (default fsb) and then multiply by FSB (ie. 250mhz fsb x 166/200 = 208mhz RAM). Memory dividers are great when you have a board that can handle really high FSB speeds but the RAM cannot be OCed as high as the FSB. Ideally it would be great to run a 1:1 speed ratio FSB to RAM, but since that is hard to achieve, dividers are the next best thing.