Hi, looking for clarity as to what the jumper actually does. Let's say in an a4000 I am using a 3640 running at 30mhz vs the stock 25. With the jumper in EXT what is it actually doing? telling the mb to use the clock from the CPU card (in effect running the mb at 30mhz) OR is it telling the CPU card don't use the mb clock and run with your own crystal?
Thanks
