If you know the speed of the processor e.g. 400, 450 or 500 and you can find the jumper settings printed on the mothrboard or in the board manual if you have one you can see if the board supports it. The jumpers are usually 2x, 3x, 3.5x etc and you multiply this by the bus speed which gives you the cpu speed. eg 100 mhz bus speed at 4.5x is the setting for a K62 450 processor. A lot of info can be found reading the older motheboards. hope this helps.