They idle at 40-50C. I haven't measured in game yet though. If you look to the right of the cards, there's two 90mm fans stacked on top of each other that push air through the front, this helped me lower temps drastically last summer with the triple 8800s. The fans on the acrylic door are positioned so one blows in cool air, and the other is reversed so it can be like an exhaust for the hot air inside the case, this should help with air circulation around the cards I think