www.handango.com $9.99 but it is available from several sites selling PDA software, be sure to get the latest revision which just came out, but buying it guarantees free updates forever. It has a somewhat funny registration that is tied to the PDA ID. When I exchanged base unit, I had to get new registration# which was free--just a bit of a hassle. Here is a site that shows how it works. I don't understand most of it, so I read on-line manual & simply set the x5 300 to the max the manual said. There is one of x5 400,too. I didn't fool with the rest of the stuff as I hate re-installing, restoring, etc.
There are other overclocking programs, too. I just settled on this one when someone on this forum under different topic mentioned it.