a better response to this issue at say click here forums. Or the click here forums.
I don't have an answer for you my friend but more questions - You say 45c is that the graphics core temp or ambient in the case? Sounds a bit low for that 68 card - which is good.
Is the CPU fan correctly seated and has heat conduction paste well applied. Is the fan working?
Without changing anything else I wonder if the CPU temp is too high.