Product Detail Built-in temperature sensor Variable speed: RPM increases as the temperature rises Double ball bearing design for extended life Comes with a 4-pin power connector and a separate signal connector to motherboard Up to 80 percent quieter Thermally controlled 92mm case fan . The "Antec 92MM SMARTCOOL Thermally Controlled 92mm Case Fan" is best product for you. We recommended Antec 92MM SMARTCOOL Thermally Controlled 92mm Case Fan