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
  • 3 pre-installed, virtually inaudible be quiet! Silent Wings 3 PWM fans
  • Full-circuit airflow system with noise-reducing vents all around the case
  • 4 areas for water cooling radiators up to 420mm on top, front, back and base
  • 3 years manufacturer’s warranty
  • German product conception, design and quality control


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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 3 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 3 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 9 additional fans, up to 4 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 2 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 3.2 Gen. 1, 2x USB 2.0, HD audio jacks.

All models at a glance:

Product Series

General data

ModelDark Base 900 Black
Color optionBlack
Motherboard compatibilityE-ATX / XL-ATX / ATX / M-ATX / Mini-ITX
Case size excl. stands (L x W x H), (mm)-
Case size incl. stands (L x W x H), (mm)577 x 243 x 585
Volume (l)82.03
PSU form factorATX PS/2
Weight (kg)14.18
Expansion slots8


open all / close all

Pre-installed fans

Fan at top-
Fan at front2x Silent Wings 3 140mm PWM
Fan at side-
Fan at rear1x Silent Wings 3 140mm PWM
Fan at bottom-
Dimensions (L x W x H), (mm)Front: 140 x 140 x 25 / Rear: 140 x 140 x 25
Fan speed at 100% PWM / 12V (rpm)1000
Airflow at 100% PWM / 12V (CFM / m3/h)59.5 / 101.09
Air Pressure at 100% PWM / 12V (mm H2O)1.08
Noise level at 100% PWM / 12V (dB(A))15.5
Voltage range (V DC)5 - 13.2
Input power (W)3.6
Input current (A)0.3
Connector4-pin PWM
Lifespan (h / 25°C)300,000
Fan controllerManual stepless fan controller (3x 4-pin / 3x 3-pin)

Maximum fan installation

Maximum fans10
Top (mm)4x 120 / 3x 140
Front (mm)3x 140 / 3x 120
Side (mm)-
Rear (mm)1x 140
Bottom (mm)2x 120 / 2x 140
PSU shroud-

Optional radiator installation

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

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
Maximum PCIe slots with vertical graphics card (pcs.)-

Drive bay capacity

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

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


LED illumination-
LEDs (pcs.)-
LED type-
LEDs synchronizable with controller/motherboard-

I/O Panel

USB 3.2 Gen. 2 Type C-
USB 3.2 Type A2
USB 2.02
HD Audio I/OMic + Audio
Qi charger / Quick Charging Option-

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



Top coverABS / Aluminum
Front panelABS / Aluminum
Side panelABS / Steel
Side panel window-

Safety certification

ApprovalsCE, UKCA

Environmental directives


Scope of delivery

Screw set (Drives/Motherboard)
Additional standoffs (pcs.)3 (for E-ATX)
SSD bracket for PSU shroud-
LED strips (pcs.)-
Cable ties (pcs.)6 (Velcro)
Screw box-
VGA holder-
VGA holder for inverted layout-
Mesh Front Panel-
ODD Bracket
Fan / Radiator bracket for multi mounting panel-


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

Logistics data and RRP

Article numberBG011
EAN code4260052184929
Dimensions, package (L x W x H), (mm)655 x 325 x 680
Gross weight, package (kg)16.3
Pieces per packaging unit1
RRP (€)244.90

DARK BASE 900 | Black
Article number: BG011