I have no problems with the heat. Fans run at minimum. Do you have enough distance to other cards? Do you have a coordinated vent? In the front, out the back? Or from the bottom to the top? I have 5 x 12 cm fans in it. Air supply from below and in front. Exhaust air to the top and back. Check your fans to see if they are working in the right direction. If all else fails, build an exhaust duct for the graphics card. What is it like when you leave the case open?