Hello, Just got my nvidia gefore 6600 256MB video card.. I seem to notice that after a period of say 10-30 minutes, the screen on my LED 24 inch cinema display flickers off and then on.. I have diagnosed the problem as not being my LED display as it works fine on my mac pro.. Also, I have the LED Cinema Display hooked up via the Kanex MDP-DVI adapter.. Also used this with my 7800 GT and no problems.. Here is something to note as far as the temperature of the 6600 is concerned: fluctuates between 141-143 degrees fahrenheit.. Can someone recommend how to bring the temps down on this? Can I just unscrew the heatsink and re-apply ARCTIC SILVER to the GPU? Has anyone ever had problems with the Nvidia Geforce 256MB video card? Just this past second, the screen flickered off and on.. I am thinking of putting back my 7800 GT. Advise?