How far do you think I can over clock this safely and at what idle temperature should I stop over clocking because I tried using coolbits to overclock and the temperature still idles at around 45C.
Sounds very weird. Just try a game / any other app that needs a lot of power from the gpu and see what the temps are like then. And as a general rule, as long as there are no artifacts and temps are under 100C (under load) it's all good.