Antec's Two Cool 120 fans bring proven cooling & Quiet Computing into a 120 mm size. A convenient switch allows users to easily choose either silent 600 RPM or maximum 1200 RPM cooling, while sleeve bearings ensure overall quiet operation with high RPM capability. The lower noise & high cooling capability of Two Cool 120 provides better airflow at lower speeds than comparable 80 mm fans. Two Cool 120 is both an ideal upgrade for underperforming stock fans & an excellent choice for PC builds.