Man, Maximum GPU Temperature (in C) 105 C means that it will automatically halt its operation at that temperature, not that it is good to operate up to that temperature. On my old computer GeForce 6600GT had maximum GPU temperature around 120C. After I overclocked it to play Oblivion, it started to heat to those 80C. After several months it started to heat even more. After a year it started to heat to its max on every game, not only Oblivion. On heating to max it always halted, resulting in a freeze and then a blue screen. I had to purchase a new graphics card.
But it's your card, so it is for you to decide how to treat it.
Medura, good luck killing your so called "gaming" PC. I looked carefully at the specs you posted. It is anything but gaming. I have no idea how that graphics card of yours can run this game smoothly, unless you turn your settings below average.
Even for my GTX570 to run it smoothly I have to choose: either I want 16xQ CSAA or general drawing quality set on 10, but not both. For 16xQ CSAA I have to set general drawing quality on 8 to have no lags, above that I'll have to turn anti-aliasing off completely, or else it lags. Even with general drawing quality set to 9 the game doesn't run completely smooth with anti-aliasing.