<b>Outstanding flexibility and silence</b><br><br>be quiet! Dark Base 900 Black is the perfect case for all of those who expect the highest standards when it comes to modularity, compatibility and design.<br><br>- Relocatable motherboard tray with the possibility of an inverse layout <br>- Repositionable HDD tray with single HDD slots for individual space requirements <br>- Three pre-installed, virtually inaudible be quiet! SilentWings® 3 140mm PWM fans <br>- Manual stepless fan controller supports up to three PWM and three 3-pin fans <br>- Effective full-circuit airflow system with noise-reducing vents all around the case <br>- Water cooling ready for radiators up to 420mm on top, front, back and base <br>- Completely sound insulated with decoupled elements for motherboard, power supply and drive slots <br>- Three years manufacturer’s warranty <br>- German product conception, design and quality control<br><br>be quiet! Dark Base 900 Black offers unrivaled flexibility with impeccable c This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5110-00-260-1702, indicating validated use in U.S. government and defense logistics supply chains.