Cooling performance for non-overclocking was toward the middle of the field of test units, but when you stress the system with a mild overclock, the S40 knocks on the 100 °C door, and that is a door we try to stay away from. Two things that I think would help the S40 would be a larger fan with a higher speed to move more air, like a standard square case fan, and for Deep Cool to move the heat pipes away from each other (space them out) to give each pipe better access to a clean stream of cool air.