The reason for that is so that this tool will be as "universal" as possible to work with as many cards as possible. It's primary purpose was to unlock the higher OC's in the OD panel, however due to all the different interactions involved, it had to be enhanced to compensate for various models. The CCC "syncs" with the profile.xml file. I was changing a ton of stuff in the profile file to test a few things out and watched CCC sit there with a pop up about synchronizing settings for several seconds. Also just changing too many different clock settings all at once can cause the OD panel to be blank for a few seconds before it comes back. Unfortunately it's not as simple as just changing some clocks and you're done. The driver itself also interacts with all of this when CCC is running. The profile .xml file is basically a configuration or settings file for CCC. Anyway, to answer your question, this does allow for certain adjustments beyond default clocks, but if you set them wrong, you may not get into windows. Then you'd need to get into safe mode, remove the reg file entry, restore your profile.xml file and reboot. I'm working on a detailed instruction sheet, but it's a work in progress as this program is still evolving somewhat. With all the different internal clocks these cards have, there is a lot more to it then meets the eye. for example, watching a video i've watched the memory clock cut itself in half on occasion, and if I set the lower limit down, it will cut itself down even further. Also you need to remember that just because you lower clocks a bit, the original voltage is still there. Bottom line, some clocks can be adjusted a bit, but if you adjust them the wrong way, you may be spending a lot of time trying to fix things. What card do you have and what exactly is it you want to change and why?