There is also a free tool available (MSI Kombustor) that can be used to benchmark your GPU. It puts a 100% load on the GPU. If your card reaches more than 90-100 ｰC here as well, there is something severly wrong with your hardware/cooling.
My Radeon HD7870 never gets hotter than 75 ｰC, no matter in which game, D:OS included...
I've had weird results with Kombustor. It didn't put my 780 Ti into boost clocks, they'd only stay stock, so it was useless as a stress test. Heaven has always worked for me though.
Temps, as followed by "CPUID Hardware Monitor" get to 110 or 115-117 Celsius.
Google says your card's thermal limit is 120C (I have never read of a card with such a high HT), though those temps are not normal at all. Run Heaven (Google it) and watch usage/temps. You're going to see the same results if you run it for 5-10 mins. You should start shopping for a new GPU, cause that one is on it's way out.
