At the temperature of 97-98 celcius, as most of the 600 series GPUs I believe. The GPU will shut down if the temperature exceed the just mentioned temperature.
A lot of people often believe that temperatures of 80-90 celcius are bad. They're not awesome, but the GPU is made to handle such temperatures. IF you're unhappy with the temperatures you currently got, then you possibly could install MSI afterburner, EVGA precision etc. and increase the GPU fan speed.
That's probably Nvidia's Turbo in action. If you increase the fan RPM to decrease temperature, it might let the GPU go to a higher clock. If not, then that may be as high as you can go for BF3 in that situation.
Ok, I'm now currently running BF3 and it states that my GPU Clock is at 915MHz, but how do I increase this? I've trieincreasing it in nvidia inspector but no change. it just stays at 915MHz.
The softwares to increase your GPU fan speed as I mentioned also are great for overclocking. However it might be difficult overclocking laptop GPUs, and you would like to be careful with such. It's not the same, as on a desktop.