As of now ive tested all frequencies at its highest mhz and it reboots every single time. Im still testing but i can assure you that 1.45 ghz does not work for more then 5 min.
Are you talking about the Droid X/2 Overclock app? Cause I've used the easy root method from the dev and it works like a charm. But I've been reading comments for this new app and not all of them are good.
But then again some people don't know how to use such an app (me).