Has anyone ever used RivaTuner 15.8? I was wondering if anyone used it and if they had a good experience with it or not.... because I noticed that you can overclock your video card using this program but im just not sure if its a safe program that wont end up messing up my video card... also what can happen if I overclock my video card? what are some of the pro's and con's of doing that... any feedback is appreciated!