something strange happened when i tried to over clock gtx 560 screen colors changed and some dots appeared ,lines and squares with pink and white colors and windows freeze for seconds and then a message appeared "a driver stopped working and it's recover" !!! every thing returned to normal i slightly increase the core from 2004 to be 2140 as i remember !! what is just happened ... also the temperature when i tried to increase the core was slightly increased then dropped for one percentage it was not that hot !! any suggestion please
try going to zotac's website and downloading firestorm. I assume it works for most models it was a free download from zotac when i got my card (got from website without any sort of registration) its very simple shows temperature and has slide bars for fan speed / clock speed. Worth checking out, like i said not sure if it works for all models but im sure it wouldnt hurt to try its very decent and easy to understand. my favorite so far.