Just an update. I have successfully reach a whopping 700mhz/480mhz, considering stock was a mere 540/400. My GPU is still maintaining full load at around 60C. I have increased core clock speeds by over 25% and the temperature is still virtually the same as before, around 45C idle and 60C stress. When does it end? I am starting to wonder if the overclock is even working, despite being recognised in Ati Tools, Ntune, and my GPU software. I am just skeptical as to how core temperature could not have possibly raised after such a drastic boost in core clock and memory clock. How long does it take playing a highly intensive 3D game to get GPU at full temperature? I'm assuming only 5-10 mins as it seems to get up to temp pretty quickly and it stays fairly constant at this range. I am doing my benchmark testing with Quake 4 everything maxed out at 1680x1050 on 8600gt. I am running GPU temp control in the background so i can monitor it as i play games. Any valid explanations as to why my temperature hasen't increased, assuming that the overclock is even working? How can i be 100% sure? It sure would be nice if it is true, i could overclock to infinity! LOL.