I have two Asus Extreme N7800GTX's running in SLI configuration. They both always run between 32C (idle) - 55C (max) depending on what they are doing.
Well...I loaded up Galciv 2 at my native 1680x1050 resolution and saw that both cards were at 70C and rising! A case alarm went off which is what prompted me to check their temperatures.
I've never seen this with any other extremely graphic intensive games I've thrown at these cards. I guess I need to extend my cpu liquid cooling to the video cards if I want to play Galciv 2 safely because they are already being cooled very well by two 120mm fans.
Other then that, Great game!