Its main role is to cool the CPU, but by reducing the heat given off by the latter, it helps to maintain a lower ambient temperature in the PC case, which means that the GPU is less affected by ambient heat and can operate at lower temperatures.

Hello,

The components won't heat up on contact, it's just a question of airflow. Be careful that the Noctua doesn't push air onto the GPU but if it's fitted and equipped correctly it's OK.