Article number: BG010



Outstanding flexibility and silence

be quiet! Dark Base 900 Orange 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 Orange 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 3.2 Gen. 1, 2x USB 2.0, HD audio jacks.

All models at a glance:

Product Series

General data

ModelDark Base 900 Orange
PSU form factorATX PS/2
Motherboard compatibilityE-ATX / XL-ATX / ATX / M-ATX / Mini-ITX
Installation of motherboards with backplate
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
Dimensions side panel window (L x W), (mm)-
Weight (kg)14.18
Color optionOrange
USB 2.02
USB 3.2 Gen. 12
USB 3.2 Gen. 2 Type C-
HD Audio I/OMic + Audio
Expansion slots8
Fan mounting locations12
Qi charger / Quick Charging Option-


open all / close all


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

Drive bay capacity

5.25 bays2
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 @ top-
Fan @ front2x Silent Wings 3 140mm PWM
Fan @ rear1x Silent Wings 3 140mm PWM
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)1000
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
Lifespan (h / 25°C)300,000
Fan controllerManual stepless fan controller (3x 4-pin / 3x 3-pin)

Maximum fan installation

Front (mm)3x 140 / 3x120
Top (mm)4x 120 / 3x 140
Bottom (mm)2x 120 / 2x 140
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


Max.construction height of CPU cooler unit (mm)185
Airflow channelFull 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

Side panel2


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)


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

Logistics data, RRP

Article numberBG010
EAN code4260052184912
CertificationsCE / RoHS
Dimensions, package (L x W x H), (mm)655 x 325 x 680
Gross weight, package (kg)16.3
Pieces per packaging unit1
RRP (€)229.90

DARK BASE 900 | Orange
Article number: BG010