Outstanding Flexibility and Silence


be quiet! Dark Base 900: unrivaled flexibility with impeccable cooling and silence features. 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. 


Dark Base 900 has numerous modularity options to satisfy every desire with lots of features to support special configurations. Aluminum surfaces and steel offer highest stability with a look of extreme elegance. Simply an engineering work of art!

  • 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
  • Effective full circuit airflow system with innovative noise-reducing vents all around the case
  • Completely sound insulated case with decoupled elements for motherboard, 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






• High-end workstations and desktop PCs

• High-resolution gaming and multimedia systems

• Extremely overclocked systems

• Super silent water-cooled PCs



Unrivaled 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

• Repositionable 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 7 decoupled HDDs, 15 SSDs and 2 optical drives





Impeccable Cooling and Silence


• Three virtually inaudible SilentWings® 3 140mm PWM fans offer unrivaled 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-optimized 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

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

• Installation of up to six additional 140mm fans or up to nine 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

• 2-in-1 side panel vent can be closed for silent operation or opened with the possibility to mount two additional 120mm fans





Advanced Assembly and Handling


• Generous space thanks to repositionable single HDD slots

• Impressive features permit individual configurations and setups

• Customizable 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 aluminum surfaces

• Steel parts from 0.8mm to 1.0mm for highest stability

• Compatibility with all be quiet! products and all available graphics cards





Outstanding Service and Support


• 3-year manufacturer's warranty

• Quick support is available via our international hotline, Mondays to Fridays from 9:00am to 5:30pm CET: 

+49 (0) 40-736 76 86 - 98

Be Quiet! Dark Base 900 Gaming Case, E-ATX, No PSU, Tool-less, 3 x Silent Wings

  • Specification



    Product Description

    Be Quiet! Dark Base 900 Gaming Case, E-ATX, No PSU, Tool-less, 3 x Silent Wings 3 Fans, Modular Construction, Orange Trim

    Form Factor


    Power Supply Wattage

    No PSU

    Motherboard Support

    XL-ATX, E-ATX, ATX, Micro ATX

    Connectors / Controls

    2 x USB 3.0
    2 x USB 2.0
    HD Audio (mic & headphone jacks)

    Drive Bays

    2 x 5.25" (removable)
    7 x 3.5" (individually removable)
    1 x 2.5" on motherboard tray
    14 x 2.5" inside HDD slots (removable)

    Expansion Slots

    8 x Expansion Slots

    Cooling System

    2 x front 14cm Pure Wing 2 Fans
    1 x rear 14cm Pure Wing 2 Fan

    Optional fans (mm):
    Top: 3x 140 / 4x 120 / 1x 180
    Front: 1x 140, 120 (w/o ODD cage)
    Bottom: 2x 140, 120
    Side panel: 2x 120


    Liquid cooling:
    Top: 120, 140, 180*, 240, 280, 360, 420
    Front: 120, 140, 240, 280, 360, 420
    Rear: 120, 140
    Bottom: 120, 140, 280


    Black and Orange


    0.8 - 1mm steel
    ABS plastic, 0.8mm


    VGA card:
    w/o HDD slots: 470 mm

    Max CPU cooler length: up to 185 mm

    without bottom fan: 150 - 184 mm


    14.2 kg
    (L x W x H) 577 x 243 x 585 mm

    Additional Features

    See Overview

    Package Weight

    17.4500 kg


    3 Years