You forgot to give us a critical piece of information here: What exactly is the graphics card you are using? It seems to be a dual-gpu or CF/SLI configuration.
Does your case have good ventilation? You should make sure that airflow is good inside the case to lower temperatures. However, 67C is too high to be an idle temperature, especially since the room temperature is 10C as you say. Check your case for dust or anything that impedes airflow. Also, check if the fans, especially the GPU fan, are working.