Thanks for your reply. I am using a very well designed case (the fortress ft-02) so I have great airflow. I am willing to try and remove those. Could you tell me how I can remove those without harming the card ? Thanks a lot.
Either run the PC for a while and let the card heat up then shut it down and remove the card as quickly as possible and then gently twist them off or take the card out and use a hair-dryer to warm each one up in turn again using a twisting motion to get them off.