be quiet! BG005 Silent Base 600 Case, Orange Outstanding performancethanks to an innovative construction that assures excellent cooling efficiency and a perfect air-circulation at well-known whisper-quiet operation Excellent usabilitywith simplest mounting and tool-free fitting of drives, an intelligent and adaptable cable solution, and air intake filters that are easily accessed for cleaning Two pre-installed Pure Wings 2fans feature nine airflow-optimized fan blades and are decoupled from the case to circulate air with a minimum of vibration and the quietest possible operation