In the past graphics cards were notoriously crappy with their cooling "elements". How is it now?
They are big and loud. Cooling is not an issue if the case has sufficient airflow.
You may have to manually adjust the fans, because the drivers may think 92C is not a good enough reason to go above 34% fan speed.
While this is true, AS5 will lower temps by 5-7°, multiplied by the number of GPUs. It could add up to a substantial reduction in room heating. I would however, suggest getting AS ceramic if you decide to do this! It is non-conductive, and works *almost* as well.
The application of TIM is Important too! Just a tiny dot in the center of the die will do. Too much, and it will actually insulate more than conduct heat.