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be quiet Dark Base 900 Chassis

The Dark Base Pro has numerous modularity options to satisfy every desire with lots of features to support special configurations. Aluminium surfaces and steel offer highest stability with a look of extreme elegance. Simply an engineering work of art!


  1. Fully versatile thanks to modular construction
  2. Three pre-installed SilentWings 3 140mm PWM fans
  3. Effective full circuit airflow system
  4. Completely sound insulated case
  5. Four areas for water cooling radiators

The be quiet! Dark Base 900 features unrivalled flexibility with impeccable cooling and silence attributes. It was designed for high-end enthusiasts and individualists – all of those who expect the highest standards when it comes to modularity, compatibility and design for their high-end workstations as well as overclocked and silent water-cooled systems.

Pro or not Pro, that is the question!

Physically there is no difference between the Pro and non-Pro version of the Dark Base 900. They both feature modular construction and three 140mm SilentWing fans. Apart from the obvious tempered glass side panel the Pro version also features a Qi (pronounced Chee) charger. This allows for you to wireless charge at Qi compatible device, like a mobile phone. The other feature to note is that the Pro is supplied with an eye-catching RGB LED illumination that you can freely position in the case. The only other difference to note is that the Pro version has a USB Type-C port at the front of the chassis. If these features appeal to you then go for the Pro. If not, then opt for the non-Pro version. Whichever case you choose you will not be disappointed.


  • High-end workstations and desktop PCs
  • High-resolution gaming and multimedia systems
  • Extremely overclocked systems
  • Super silent water-cooled PCs

Unrivalled Flexibility

  • Motherboard tray with enhanced possibilities to suit individual space requirements
  • Completely relocatable and usable as a test bench
  • Adjustable to three different heights
  • Installation alongside the left panel for an inverted layout
  • Reposition HDD tray for individual space requirements inside the case
  • E-ATX and XL-ATX support permits installation of practically any motherboard
  • Installation options of up to seven decoupled HDDs, 15 SSDs and two optical drives

Impeccable Cooling and Silence

  • Three virtually inaudible SilentWings 3 140mm PWM fans offer unrivalled and uncompromising performance with a broad range of amazing features
  • 6-pole fan motor for very low power consumption and less vibration
  • Fluid-dynamic bearing with copper core enables a super long life span
  • Unique airflow-optimised fan blade design
  • Fan frame with funnel-shaped air inlets produces high air pressure
  • High quality IC motor controller reduces electrical noise
  • Intelligent full circuit airflow system with noise-dampened vents all around the case
  • Advanced PWM hub and manual fan controller supports up to four PWM and four 3-pin fans
  • Installation of up to six additional 140mm fans or up to seven additional 120mm fans possible
  • Ready for water cooling radiators up to 420mm with four mounting slots
  • Front: 420mm – Top: 420mm – Back: 140mm – Base: 280mm
  • Built-in insulation in front, top cover and side panels
  • Decoupled motherboard tray, power supply tray and drive slots for reduced vibration and noise

Advanced Assembly and Handling

  • Generous space thanks to repositionable single HDD slots
  • Impressive features permit individual configurations and setups
  • Customisable cable management thanks to carefully placed pass-throughs
  • Two cleanable dust filters that can be conveniently removed from the front

High-quality Materials and Elegant Design

  • Premium aluminium surfaces
  • Steel parts from 0.8mm to 1.0mm for highest stability
  • Compatibility with all be quiet! products and all available graphics cards
  • RGB LED illumination that is synchronisable with RGB controller/motherboard, Pro version only
  • Wireless charger for Qi enabled devices (e.g. smart phones), Pro version only
  • Elegant side window of 4mm tinted and tempered glass, Pro version only

Product Resources

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