Antec's TwoCool 140 fan brings proven cooling and Quiet Computing to the increasingly popular 140 mm size. A convenient switch allows users to easily choose either silent 800 rpm or maximum 1200 rpm cooling, while sleeve bearings ensure overall quiet operation with high RPM capability. The low noise and high cooling capability of the TwoCool 140 provides better airflow at lower speeds than comparable 120 mm fans. The TwoCool 140 is both an ideal upgrade for underperforming stock fans and an excellent choice for PC builds.