Originally Posted by EasirokThunderpants
ATI GPU chips tend to run hot, and tend to be very sensitive to air circulation issues.
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The HD 5850 is one of the
cooler running GPUs currently still available, though I'm not sure about the mobile version.
And as you do use the mobile version, I assume you also use a laptop to run the game. I've had similar problems with my laptop, though not for WoW but mainly in first person shooters. The general cooling solution simply wasn't completely thought through, and the accumulated heat from both the CPU and the GPU simply was too much for the tiny fans to handle.
You should absolutely keep an eye on the temperatures of both your CPU and GPU while you're playing the game. For the CPU there are tools like RealTemp, and for the GPU I like to use GPU-Z for such monitoring issues (since it also features logging).