hope this helps you out

Danger zone (high) temperatures are pretty standard due to manufactures low-level specifications of usage. Danger temps are set to downclock the component such as the CPU or GPU in order to cool the component down enough to prevent overheating

Here are temperatures for specific components when they enter the danger zone.:

CPU danger temperature is around 70C
GPU danger temperature is around 90-95C
HDD danger temperature is around 60-65C

Threshold temperatures are also pretty standard once again due to the reasons specified under the danger zone temperatures. These temperatures are the most dangerous to a system, in which permanent hardware damage can be incurred if the user does not remedy the heat issue during which time the user is experiencing temperatures within the danger zone. Systems that have a component that reaches threshold temperatures will usually crash or shutdown when the temperature peaks.

CPU threshold temperature is around 90-100C
GPU threshold temperature is around 100-105C
HDD threshold temperature is varied, but above 65C is bad

Safe temperatures are temperatures are basically any temperature below the danger zone temperatures. Even a 5C-10C difference is ok as long as it stays below the danger zone temperatures.

I have exactly the same problem, except that my video card is SLI 8700M GT.

My GPU is always between mid 60s to mid 70s and my CPU is around 40

Would like to know if this is normal. I have been reading posts for people having lower temperatures at idle use.