I have ATI software and interface for my Radeon GPU. It is not very good but it does the job but I want more until i buy a new one tomorrow. Here is the overclock that I am afraid of activating to maximum setting. My PSU is only 17A x 12V = 204W...
Will I ruin my PC if I pull slider all way to right?
Moving the slider all the way to the right will probably cause your gpu to crash, weather it has enough power or not. Overclocking should be done a little at a time and tested . If you are not sure you should leave it alone until you have read up on it.