The intelligent programmed temperature controller and accurate temperature detection make Arctic F Pro TC the best TC fans. Unlike other generic temperature controlled case fans, the Arctic F Pro TC fan provides cooling according to not only the temperature, but also the overall necessity for cooling.The programmed temperature controller plays a key role. Once a gaming system is at load, the case ambient air temperature will go up speedily, and without any case fans, most likely it will rise above 40°C, an overheated level for most PC cases. High performance and instant cooling is vital at this stage in order to eliminate the risk of overheating and system instability.The Arctic F Pro TC is programmed to achieve top fan speed at 38°C. The fan responses to the rise in temperature swiftly - within a critical 6°C range, the rpm of the Arctic F Pro TC fan increases from around 500 to its maximum of 2,000 rpm. Heat is dissipated from the case rapidly in order to achieve immediate cooling. As a result, the case air temperature remains at 38°C or below and thus the possibility of having a system failure can be eliminated.