Article number: BG011



Outstanding flexibility and silence

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

  • Completely relocatable MB-tray with the possibility of an inverse layout
  • Repositionable HDD tray for individual space requirements inside the case
  • Three pre-installed, virtually inaudible be quiet! Silent Wings 3 PWM fans
  • Full-circuit airflow system with noise-reducing vents all around the case
  • Four areas for water cooling radiators up to 420mm on top, front, back and base
  • Three years manufacturer’s warranty
  • German product conception, design and quality control



Flexibility for individual requirements

The decoupled motherboard tray adapts to suit individual requirements, being completely relocatable and usable as a test bench. You can adjust it to three different heights or install it alongside the left panel in an inverted layout with redefined airflow. It is fully compatible with E-ATX and XL-ATX motherboards.


Impeccable cooling and silence

The three pre-installed Silent Wings 3 140mm PWM fans offer virtually inaudible operation. They are equipped with a smooth-running 6-pole motor, durable fluid-dynamic bearing and airflow-optimized fan blade design. The frame has funnel-shaped air inlets that generate high air pressure.


Generous space for your setups

The installation options are flexible thanks to repositionable single HDD slots. Supports up to 7 HDDs, 15 SSDs and 2 optical drives. The assembly and handling concept gives you modularity choices, empowering you to create systems that meet the highest of standards.


A silence concept by the silence experts

With its smart silence concept, Dark Base 900 Black is the perfect case for the extreme requirements of overclocked systems and super silent water-cooled PCs. It can carry up to nine additional fans, up to four radiators and has noise-reducing vents all around the case that provide ultra-effective full circuit airflow.


Amazing versatility for your system

The cases side panel is equipped with an adjustable cover that flexibly suits your individual needs. You can close it for absolute silence, partly open it for more air intake, or completely remove it with the possibility to mount up to two additional fans.


Convenient features for everyone

The front I/O port offers perfect compatibility for your high-end PC. Manual stepless fan controller supports up to three PWM and three 3-pin fans. 2x USB, 2x USB 2.0, HD audio jacks.

All models at a glance:


General data

Model Dark Base 900 | Black
PSU form factor ATX PS/2
Motherboard compatibility E-ATX, XL-ATX, ATX, M-ATX, Mini-ITX
Case size excl. stands (L x W x H), (mm) -
Installation of motherboards with backplate
Case size incl. stands (L x W x H), (mm) 577 x 243 x 585
Dimensions side panel window (L x W), (mm) -
Color option Black
Weight (kg) 14.18
USB 2.0 2
USB 3.0 2
USB 3.1 Gen 2 Type C -
HD Audio I/O 1
Expansion slots 8
Fan mounting locations 12
Qi charger / Quick Charging Option -


open all / close all


Top cover ABS, Aluminium
Side panel Steel, ABS
Side panel window -
Front panel ABS, Aluminium
Stands ABS

Drive bay capacity

5.25 bays 2
3.5 slots (max.) 7
3.5 slots (scope of delivery) 7
2.5 slots (max.) 15
2.5 slots (scope of delivery) 15

Pre-installed fans

Fan @ front 2x be quiet! Silent Wings 3 |140mm PWM / 1,000rpm
Fan @ rear 1x be quiet! Silent Wings 3 |140mm PWM / 1,000rpm
Dimensions (L x W x H), (mm) Front: 140 x 140 x 25, Rear: 140 x 140 x 25
Fan speed @ 100% PWM / 12V (rpm) 1,000
Noise level @ 100% PWM / 12V (dB(A)) 15.5
Airflow @ 100% PWM / 12V (CFM / m3/h) 59.5 / 101.09
Air Pressure @ 100% PWM / 12V (mm H2O) 1.08
Voltage range (V DC) 5 - 13.2
Input power (W) 3.6
Input current (A) 0.3
Connector 4-pin
Lifespan (h / 25°C) 300,000
Fan controller Manual stepless fan controller (3x 4-pin, 3x 3-pin)

Optional fan installation

Front (mm) 1x 140 (w/o ODD cage)
Top (mm) 3x 140 / 4x 120
Bottom (mm) 2x 140/120
Side panel (mm) 2x 120
PSU shroud -

Optional radiator installation

Front (mm) 120 / 140 / 240 / 280 / 360 / 420
Top (mm) 120 / 140 / 180 / 240 / 280 / 360 / 420
Bottom (mm) 120 / 140 / 280
Rear (mm) 120 / 140

Cooling height of CPU cooler unit (mm) 185
Airflow channel Full circuit airflow system


RGB LED illumination -
LEDs synchronizable with RGB controller/motherboard -
Expandable RGB controller -

PSU compatibility

Maximum dimensions excl. bottom fan (mm) 284
Maximum dimensions incl. bottom fan (mm) 150

Graphics card

HDD cage (in height of graphics card) installed (mm) 323
HDD cage (in height of graphics card) removed (mm) 472

Insulation and damping

Top panel insulation mats -
Front panel insulation mats
Side panel insulation mats
Anti-vibration decoupled HDD
Anti-vibration decoupled fan
Anti-vibration decoupled PSU
Anti-vibration decoupled motherboard-tray

Removeable dust filters

Front 1
Bottom 1
Side panel 2


Screw set (Drives/Motherboard)
Rubber rail (pcs.) -
Standoff (pcs.) 3 (for E-ATX)
LCS bracket (pcs). 1
HDD slot cover (pcs.) -
Upper fan bracket (pcs.) 1
HDD panel rubber grommet (pcs.) 1
SSD bracket for PSU shroud -
LED strips (pcs.) -
Cable ties (pcs.) 6 (Velcro)
Cable tie holder (pcs.) -


Warranty (Years) 3
International hotline / free of charge ✓ / DE, FR

Logistics data, RRP

Article number BG011
EAN code 4260052184929
Certifications CE, RoHS
Dimensions, package (L x W x H), (mm) 655 x 325 x 680
Gross weight, package (kg) 16.3
Pieces per packaging unit 1
RRP (€) 209.00

Article number: BG011