I recently installed an Accelero Xtreme 7970 VGA cooler on each of my Reference Sapphire HD 7970's. The cards stay far cooler and are much quieter than the reference coolers. The problem is whenever they are put under load, after a few minutes, my monitors will go black(as if put to sleep) and the system will become unresponsive. I cannot wake it and must hard reset it, in order to bring it back up. I was initially afraid that maybe the thermal glue holding on the various small heat sinks was shorting something out on the board. I just learned however that the "G-1" thermal glue is non-conductive. The only thing I can think of that I changed is the crossfire cable. I am now using the back connectors instead of the front. Help?