Cougar Vortex HDB 120 Cooling CF-V12H, Orange Fan Size: 120mm The 4-Pin connector allows the mainboard to control the fan speed from 800-1500RPM. Optimum airflow, air pressure & extremely silent performance Innovative blade design focus air flow & optimum cooling efficiency Reduce the vibrations efficiently & silent operation Air-inlet with optimal aero-dynamical design reducing noisy air turbulences HDB runs more smoothly with no friction, make it quietly & durability(MTBF300,000hrs) Rubber fixed pins also reduces vibrations (fan run more quietly) and Tool-less makes it easy to mount, with no tools required