it depends on the core clock and gpu usage. in my experience for some older games my GTX460 will only enter half idle clock thus my temps were lower when playing those games. it does not matter if the game graphically intensive or not as long as the game let your card to use its full 3d clocks and almost 100% of gpu utilization the temperature will surely goes up.
Thank you for clearing it up, I just freak out when I see high temps. :[ haha but very helpful!