Outstanding Flexibility and Silence

The be quiet! Dark Base 900 PC case is the perfect choice for all of those who expect the highest standards when it comes to modularity, compatibility and design. be quiet! Dark Base 900 offers unrivaled flexibility with impeccable cooling and silence features. Simply an engineering work of art!

HIGHLIGHTS Fully versatile thanks to modular construction, offering an relocatable motherboard tray, repositionable HDD slots, support for even E-ATX and XL-ATX as well as the possibility of an inverse layout

Three pre-installed SilentWings® 3 140mm PWM fans featuring a smooth-running 6-pole motor, fluid-dynamic bearing and funnel-shaped air inlets

Manual stepless fan controller supports up to three PWM and three 3-pin fans

Effective full circuit airflow system with innovative noise-reducing vents all around the case

Completely sound insulated case with decoupled elements for motherboard tray, power supply and drives

Four areas for water cooling radiators up to 420mm on top, front, back and base of the case

2-in-1 side panel vent can be closed for silent operation or opened for two additional fans

Product conception, design and quality control in Germany



MB-tray The motherboard tray can be repositioned vertically, to suit individual space requirements, or installed alongside the left panel with redefined airflow. It is removable for use as a bench table.



SilentWings® 3 The three pre-installed virtually inaudible SilentWings® 3 PWM fans with unique fan blade design, rubberized fan frame and funnel-shaped air inlets provide excellent air circulation.



Side panel Adjustable side panel cover that you can close for absolute silence, partly open for more air intake, or completely open with the possibility to mount up to two optional fans.



Front I/O port Manual stepless fan controller supports up to three PWM and three 3-pin fans. 2x USB 3.0, 2x USB 2.0, HD audio jacks.



HDD slots Flexible installation options thanks to repositionable single HDD slots. Support for up to 7 HDDs, 15 SSDs and 2 optical drives.